Alignment method and arrangement for use with a view camera

• US 4,733,257 A
• Filed: 05/13/1987
• Issued: 03/22/1988
• Est. Priority Date: 05/13/1987
• Status: Expired due to Fees

• Current Assignee: William R. Ziegler
• Original Assignee: William R. Ziegler
• Inventors: Ziegler, William R.
• Primary Examiner(s): Hix, L. T.
• Assistant Examiner(s): Brown, Brian W.
• Application Number:
  US07/049,738
• Time in Patent Office: 314 Days
• Field of Search: 354/187, 354/188, 354/189, 354/191, 356/138, 356/153, 33/281, 33/286
• US Class Current: 396/342
• CPC Class Codes: G03B 5/00 Adjustment of optical system relative to image or object surface other than for focusing

Abstract

A view camera which includes, among other components, a lens standard for containing a lensboard and lens and a film standard for receiving a film holder containing film is disclosed herein along with a reliable technique for aligning the lens and film standards such that the lens plane defined by the lens standard and the film in the film standard are in confronting, parallel relationship to one another. This is accomplished by optically utilizing a set of mirrors within the camera and indicia located on at least one of the mirrors. The latter are manipulated until the indicia takes on a specific form, as viewed from outside the camera, which form corresponds to the desired parallel relationship between the film and lens plane.

Claims

1. An alignment arrangement for use with a view camera assembly having a lens standard for containing a lensboard which carries the camera'"'"'s lens and defines the camera'"'"'s lens plane, a film standard in spaced-apart confronting relationship with said lens standard and configured to receive a film holder containing film, a camera housing connected with and extending between said lens and film standards, and means for supporting the lens standard, film standard and camera housing such that the standards can be adjustably moved with respect to one another to maintain a confronting, parallel relationship, said alignment arrangement comprising:

(a) a first mirror member having a mirror body including a mirrored surface, said first mirror member being configured to fit within said film standard in lieu of a film holder so that said mirrored surface faces said lens standard;

(b) a second mirror member having a mirror body including a mirrored surface and a view hole through said mirror body and mirrored surface, said second mirror member being adapted to replace temporarily said lens and its lensboard within said lens standard so that said second mirrored surface faces said film standard and first mirrored surface and so that the mirrored surfaces can be viewed through said view hole from outside said lens standard; and

(c) indicia on at least one of said mirrored surfaces such that, when said mirrored surfaces are viewed through said view hole from outside said lens standard, said indicia will take only one of many different forms if the two mirrored surfaces are parallel, whereby the lens and film standards can be adjusted to provide said one form in another to insure that the lens plane of the camera is parallel with the camera film.

2. An arrangement according to claim 1 wherein said indicia includes a circle on one of said mirrors and a dot at the center of said circle.

3. An arrangement according to claim 2 wherein said circle is on said second mirrored surface disposed concentrically around said view hole which also serves as said dot.

4. An arrangement according to claim 2 wherein said circle and said dot are on said first mirror surface, wherein said film standard includes a ground glass, and wherein said circle and dot are defined by translucent or transparent portions of said first mirror member whereby, even if said camera housing remains assembled to the rest of said camera assembly, light from the ambient surroundings is able to enter the housing through the ground glass and the translucent or transparent portions of said first mirror member in order to make the indicia visible during adjustment of the standards.

5. An arrangement according to claim 1 including means located within said camera housing for illuminating the latter during the adjustment of said standards under those circumstances where the housing is not removed during said adjustment, whereby to make the indicia visible.

6. An arrangement according to claim 1 wherein said indicia is on said second mirrored surface disposed concentrically around said view hole which also serves as said dot.

7. An arrangement according to claim 1 wherein said indicia is on said first mirror surface, wherein said film standard includes a ground glass, and wherein said indicia are defined by translucent or transparent portions of said first mirror member whereby, even if said camera housing remains assembled to the rest of said camera assembly, light from the ambient surroundings is able to enter the housing through the ground glass and the translucent or transparent portions of said second mirror member in order to make the indicia visible during adjustment of the standards.

8. An arrangement according to claim 2 including means located within said camera housing for illuminating the latter during the adjustment of said standards under those circumstances where the housing is not removed during said adjustment, whereby to make the indicia visible.

9. In a view camera assembly having a lens standard for containing a lensboard which carries the camera'"'"'s lens and defines the camera'"'"'s lens plane, a film standard in spaced-apart confronting relationship with said lens standard and configured to receive a film holder containing film, a camera housing connected with and extending between said lens and film standards, and means for supporting the lens standard, film standard and camera housing such that the standards can be adjustably moved with respect to one another to maintain a confronting, parallel relationship, the improvement comprising an alignment arrangement forming part of the overall camera assembly, said alignment arrangement including:

(a) a first mirror member having a mirror body including a mirrored surface, said first mirror member being configured to fit within said film standard in lieu of a film holder so that said mirrored surface faces said lens standard;

(b) a second mirror member having a mirror body including a mirrored surface and a view hole through said mirror body and mirrored surface, said second mirror member being adapted to replace temporarily said lens and its lensboard within said lens standard so that said second mirrored surface faces said film standard and first mirrored surface and so that the mirrored surfaces can be viewed through said view hole from outside said lens standard; and

(c) indicia on at least one of said mirrored surfaces such that, when said mirrored surfaces are viewed through said view hole from outside said lens standard, said indicia will take only one of many different forms if the two mirrored surfaces are parallel, whereby the lens and film standards can be adjusted to provide said one form in order to insure the lens plane of the camera is parallel with the camera film.

10. The improvement according to claim 9 wherein said indicia includes a circle on one of said mirrors and a dot at the center of said circle.

11. The improvement according to claim 10 wherein said circle is on said second mirrored surface disposed concentrically around said view hole which also serves as said dot.

12. The improvement according to claim 9 wherein said indicia is on said first surface, wherein said film standard includes a ground glass, and wherein said indicia is defined by translucent or transparent portions of said first mirror member whereby, even if said camera housing remains assembled to the rest of said camera assembly, light from the ambient surroundings is able to enter the housing through the ground glass and the translucent or transparent portions of said first mirror member in order to make the indicia visible during adjustment of the standards.

13. The improvement according to claim 9 including means located within said camera housing for illuminating the latter during the adjustment of said standards under those circumstances where the housing is not removed during said adjustment, whereby to make the indicia visible.

14. In a view camera assembly having a lens standard for containing a lensboard which carries the camera'"'"'s lens and defines the camera'"'"'s lens plane, a film standard in spaced-apart confronting relationship with said lens standard and configured to receive a film holder containing film, a camera housing connected with and extending between said lens and film standards, and means for supporting said lens standard, film standard and camera housing such that the standards can be adjustably moved with respect to one another to maintain a confronting, parallel relationship, a method of aligning the lens and film standards to insure the lens plane and film are parallel with one another, said method comprising the steps of:

(a) providing a first mirror member having a mirror body including a mirrored surface and placing said first mirrored member within said film standard in lieu of a film holder so that said first mirrored surface faces said lens standard;

(b) providing a second mirror member having a mirror body including a mirrored surface and a view hole through said mirror body and mirrored surface, said second mirror member being mounted on its own lensboard;

(c) replacing said lens and associated lensboard with said second mirror member and its associated lensboard within said lens standard so that said second mirrored surface faces said film standard and first mirrored surface and so that the mirrored surfaces can be viewed through said view hole from outside said lens standard;

(d) providing indicia on at least one of said mirrored surfaces such that, when said mirrored surfaces are viewed through said view hole from outside said lens standard, said indicia will take only one of many different forms if the two mirrored surfaces are parallel;

(e) while viewing said mirrored surfaces through said view hole, adjusting said lens and/or film standards until said indicia provides said one form, whereby to insure that the lens plane of the camera is parallel with the film; and

(f) thereafter removing said first and second mirror members from said film and lens standards, respectively, and placing a film holder and said lens and lensboard in the film and lens standards, respectively.

15. A method according to claim 14 wherein said indicia includes a circle on one of said mirrors and a dot at the center of said circle.

16. A method according to claim 15 wherein said circle is on said second mirrored surface disposed concentrically around said view hole which also serves as said dot.

17. A method according to claim 14 wherein said indicia is on said first mirror surface, wherein said film standard includes a ground glass, and wherein said indicia is defined by translucent or transparent portions of said first mirror member whereby, even if said camera housing remains assembled to the rest of the camera assembly, light from the ambient surroundings is able to enter the housing through the ground glass and the translucent or transparent portions of said second mirror member in order to make the indicia visible during adjustment of the standards.

18. A method according to claim 14 wherein said camera housing remains assembled during alignment of said film and lens standards, said method including the step of illuminating said housing during the adjustment procedure, whereby to make said indicia visible.

19. A method according to claim 14 including the step of removing said camera housing from the rest of the camera assembly before the film and lens standards are aligned.