Single-lens reflex camera provided with eyepiece

• US 6,692,163 B2
• Filed: 11/13/2002
• Issued: 02/17/2004
• Est. Priority Date: 11/16/2001
• Status: Expired due to Fees

• Current Assignee: Olympus Optical Corporation Limited (Olympus Corporation)
• Original Assignee: Olympus Optical Corporation Limited (Olympus Corporation)
• Inventors: Ogata, Yasuzi
• Primary Examiner(s): Adams, Russell
• Assistant Examiner(s): BLACKMAN, ROCHELLE ANN J
• Application Number:
  US10/292,812
• Publication Number:
  US 20030156834A1
• Time in Patent Office: 461 Days
• Field of Search: 396/382, 396/384, 396/385, 396/386, 396/373, 396/148, 396/149, 396/150, 396/141, 396/142, 396/143, 396/296, 359/791, 359/784, 359/754, 359/645, 359/643
• US Class Current: 396/354
• CPC Class Codes: G03B 13/02 Viewfinders

Abstract

A single-lens reflex camera provided with an eyepiece includes a screen on which an image of an object is projected, a plurality of reflecting surfaces for erecting the image projected on the screen, and an eyepiece with positive refracting power for observing the image. In this case, the eyepiece has, in order from the object side, a first lens component with positive refracting power, a second lens component with positive refracting power, and a third lens component with negative refracting power and satisfies the following conditions:

0.15<tan S<0.35

2.00<fb/Y<5.00

−0.67<f3/f<−0.25

where S is an angle made by the most off-axis chief ray passing through a point on an optical axis with the optical axis, at a distance of 23 mm along the optical axis from the exit surface of the third lens component, and refers to the angle at a diopter of 0 m⁻¹ when the eyepiece is moved; fb is a length, in terms of air, from the screen to the entrance surface of the first lens component, and refers to the length, in terms of air, at a diopter of 0 m⁻¹ when the eyepiece is moved; Y is a diagonal length of the image plane on the screen; f3 is the focal length of the third lens component; and f is the focal length of the entire system extending from the screen to the exit surface of the eyepiece, and refers to the focal length of the entire system at the diopter of 0 m⁻¹ when the eyepiece is moved.

Claims

1. A single-lens reflex camera provided with an eyepiece, comprising:

a screen on which an image of an object is projected;

a plurality of reflecting surfaces for erecting said image projected on said screen; and

an eyepiece with positive refracting power for observing said image,

wherein said eyepiece comprises, in order from an object side, a first lens component with positive refracting power, a second lens component with positive refracting power, and a third lens component with negative refracting power and satisfies the following conditions;

2. A single-lens reflex camera provided with an eyepiece according to claim 1, wherein each of said first lens component, said second lens component, and said third lens component includes a single lens or a cemented lens.

3. A single-lens reflex camera provided with an eyepiece according to claim 1, wherein diopter adjustment is made by moving said first lens component alone.

4. A single-lens reflex camera provided with an eyepiece according to claim 1, wherein diopter adjustment is made by moving said first lens component and, said second lens component.

5. A single-lens reflex camera provided with an eyepiece according to claim 1, further satisfying the following condition:

6. A single-lens reflex camera provided with an eyepiece according to claim 1, further satisfying the following condition:

26. A single-lens reflex camera provided with an eyepiece according to claim 2, wherein said first lens component has a shape of a biconvex lens, said second lens component has a shape of a meniscus lens whose convex surface is directed toward said object side, and said third lens component has such a shape that an absolute value of a radius of curvature is smaller on a pupil side than on said object side.

7. A single-lens reflex camera provided with an eyepiece, comprising:

a screen on which an image of an object is projected;

a plurality of reflecting surfaces for erecting said image projected on said screen; and

an eyepiece with positive refracting power for observing said image,

wherein said eyepiece comprises, in order from an object side, a first lens component with positive refracting power, a second lens component with positive refracting power, and a third lens component with negative refracting power and satisfies the following conditions;

8. A single-lens reflex camera provided with an eyepiece according to claim 7, further satisfying the following condition:

9. A single-lens reflex camera provided with an eyepiece according to claim 7, further satisfying the following condition:

10. A single-lens reflex camera provided with an eyepiece, comprising:

a screen on which an image of an object is projected;

a plurality of reflecting surfaces for erecting said image projected on said screen; and

an eyepiece with positive refracting power for observing said image,

wherein said eyepiece comprises, in order from an object side, a first lens component with positive refracting power, a second lens component with positive refracting power, and a third lens component with negative refracting power and satisfies the following conditions;

11. A single-lens reflex camera provided with an eyepiece according to claim 10, further satisfying the following condition:

12. A single-lens reflex camera provided with an eyepiece according to claim 10, further satisfying the following condition:

13. A single-lens reflex camera provided with an eyepiece according to claim 10, further satisfying the following condition:

14. A single-lens reflex camera provided with an eyepiece, comprising:

a screen on which an image of an object is projected;

a plurality of reflecting surfaces for erecting said image projected on said screen; and

an eyepiece with positive refracting power for observing said image,

wherein said eyepiece comprises, in order from an object side, a first lens component with positive refracting power, a second lens component with positive refracting power, and a third lens component with negative refracting power and satisfies the following conditions;

15. A single-lens reflex camera provided with an eyepiece according to claim 14, further satisfying the following condition:

16. A single-lens reflex camera provided with an eyepiece according to claim 14, further satisfying the following condition:

17. A single-lens reflex camera provided with an eyepiece according to claim 14, further satisfying the following condition:

18. A single-lens reflex camera provided with an eyepiece, comprising:

a screen on which an image of an object is projected;

a plurality of reflecting surfaces for erecting said image projected on said screen; and

an eyepiece with positive refracting power for observing said image,

wherein said eyepiece comprises, in order from an object side, a first lens component with positive refracting power, a second lens component with positive refracting power, and a third lens component with negative refracting power and satisfies the following conditions;

19. A single-lens reflex camera provided with an eyepiece, comprising:

a screen on which an image of an object is projected;

a plurality of reflecting surfaces for erecting said image projected on said screen; and

an eyepiece with positive refracting power for observing said image,

wherein said eyepiece comprises, in order from an object side, a first lens component with positive refracting power, a second lens component with positive refracting power, and a third lens component with negative refracting power and satisfies the following conditions;

20. A single-lens reflex camera provided with an eyepiece, comprising:

a screen on which an image of an object is projected;

a plurality of reflecting surfaces for erecting said image projected on said screen; and

an eyepiece with positive refracting power for observing said image,

wherein said eyepiece comprises, in order from an object side, a first lens component with positive refracting power, a second lens component with positive refracting power, and a third lens component with negative refracting power and satisfies the following conditions;

21. A single-lens reflex camera provided with an eyepiece, comprising:

a screen on which an image of an object is projected;

a plurality of reflecting surfaces for erecting said image projected on said screen; and

an eyepiece with positive refracting power for observing said image,

wherein said eyepiece comprises, in order from an object side, a first lens component with positive refracting power, a second lens component with positive refracting power, and a third lens component with negative refracting power and satisfies the following conditions;

22. A single-lens reflex camera provided with an eyepiece, comprising:

a screen on which an image of an object is projected;

a plurality of reflecting surfaces for erecting said image projected on said screen; and

an eyepiece with positive refracting power for observing said image,

wherein said eyepiece comprises, in order from an object side, a first lens component with positive refracting power, a second lens component with positive refracting power, and a third lens component with negative refracting power and satisfies the following conditions;

 

0.15<

tan S<

0.35

23. A single-lens reflex camera provided with an eyepiece, comprising:

a screen on which an image of an object is projected;

a plurality of reflecting surfaces for erecting said image projected on said screen; and

an eyepiece with positive refracting power for observing said image,

wherein said eyepiece comprises, in order from an object side, a first lens component with positive refracting power, a second lens component with positive refracting power, and a third lens component with negative refracting power and satisfies the following conditions;

24. A single-lens reflex camera provided with an eyepiece, comprising:

a screen on which an image of an object is projected;

a plurality of reflecting surfaces for erecting said image projected on said screen; and

an eyepiece with positive refracting power for observing said image,

wherein said eyepiece comprises, in order from an object side, a first lens component with positive refracting power, a second lens component with positive refracting power, and a third lens component with negative refracting power and satisfies the following conditions;

25. A single-lens reflex camera provided with an eyepiece, comprising:

a screen on which an image of an object is projected;

a plurality of reflecting surfaces for erecting said image projected on said screen; and

an eyepiece with positive refracting power for observing said image,

wherein said eyepiece comprises, in order from an object side, a first lens component with positive refracting power, a second lens component with positive refracting power, and a third lens component with negative refracting power and satisfies the following conditions;

27. A single-lens reflex camera provided with an eyepiece, comprising:

a screen on which an image of an object is projected;

a plurality of reflecting surfaces for erecting said image projected on said screen; and

an eyepiece with positive refracting power for observing said image,

wherein said eyepiece comprises, in order from an object side, a first lens component with positive refracting power, a second lens component with positive refracting power, and a third lens component with negative refracting power and satisfies the following conditions;