PROJECTOR

• US 20190346750A1
• Filed: 07/24/2019
• Published: 11/14/2019
• Est. Priority Date: 03/30/2016
• Status: Active Grant

• Current Assignee: Fujifilm Corporation (Fujifilm Holdings Corporation)
• Original Assignee: Fujifilm Corporation (Fujifilm Holdings Corporation)
• Inventors: KURODA, Yasuto
• Granted Patent: US 10,642,135 B2
• Time in Patent Office: Days
• CPC Class Codes: G02B 27/0955 Lenses lenses per se G02B3/00
• CPC Class Codes: G02B 7/00 Mountings, adjusting means, or light-tight connections, for optical elements
• CPC Class Codes: G02B 7/021 for more than one lens
• CPC Class Codes: G02B 7/022 lens and mount having complementary engagement means, e.g. screw/thread
• CPC Class Codes: G02B 7/023 permitting adjustment
• CPC Class Codes: G02B 7/182 for mirrors
• CPC Class Codes: G03B 21/00 Projectors or projection-type viewers; Accessories therefor devices for changing pictures G03B23/00
• CPC Class Codes: G03B 21/14 Details
• CPC Class Codes: G03B 21/142 Adjusting of projection optics
• CPC Class Codes: G03B 21/2066 Reflectors in illumination beam in projection beam G03B21/28
• CPC Class Codes: G03B 21/28 Reflectors in projection beam in illumination beam G03B21/2066
• CPC Class Codes: H04N 5/74 Projection arrangements for image reproduction, e.g. using eidophor
• CPC Class Codes: H04N 9/3141 Constructional details thereof details not peculiar to the presence of an electronic spatial light modulator G03B21/14

Abstract

A projector includes a projection lens, a projector body, and an angle adjustment unit. In the projection lens, a U-shaped optical path is formed of optical axes CL1 to CL3. A lens barrel is a U-shaped barrel. The angle adjustment unit includes a fitting portion, a mounting flange, a fixing unit, a mount ring, and bearings. The projection lens is supported so as to be rotationally movable around the optical axis CL1. The fixing unit includes a mounting hole, a fixing screw, and a screw hole. The mounting hole is formed in the shape of an arc. The fixing screw is screwed with the screw hole through the mounting hole, so that the lens barrel is fixed to a housing.

Claims

1. A projection lens attached to a housing including a light source and an image forming panel, the projection lens comprising:

a first optical system that focuses illumination light emitted from the image forming panel illuminated by the light source;

a first reflective member inclined with respect to a first optical axis of the first optical system and deflects the first optical axis to a second optical axis;

a second reflective member inclined with respect to the second optical axis and deflects the second optical axis to a third optical axis;

a second optical system that projects illumination light, which is deflected to the third optical axis by the second reflective member, onto a projection surface; and

a lens barrel that holds the first optical system, the first reflective member, the second reflective member and the second optical system, and is mounted on a barrel-mounting surface of the housing;

wherein the projection lens is capable to adjust an angle against the barrel-mounting surface.

2. The projection lens according to claim 1, wherein the first optical axis is parallel to the third optical axis.

3. The projection lens according to claim 1, wherein the lens barrel is composed of at least a first holding member holding the first optical system and a second holding member holding the second optical system.

4. The projection lens according to claim 1 further comprising:

a second holding member holding the second optical system,

wherein the first optical axis extends in a first direction including one side and other side,

the illumination light incidents the first optical system from the one side to the other side, and

in a side view, the second holding member includes a part protruding from the other side to the one side.

5. The projection lens according to claim 1, wherein the lens barrel is rotationally movable relative to the housing.

6. The projection lens according to claim 1, wherein the lens barrel is rotationally movable relative to the housing by a bearing.

7. The projection lens according to claim 2, wherein the lens barrel is composed of at least a first holding member holding the first optical system and a second holding member holding the second optical system.

8. The projection lens according to claim 2 further comprising:

a second holding member holding the second optical system,

wherein the first optical axis extends in a first direction including one side and other side,

the illumination light incidents the first optical system from the one side to the other side, and

in a side view, the second holding member includes a part protruding from the other side to the one side.

9. The projection lens according to claim 3 further comprising:

a second holding member holding the second optical system,

wherein the first optical axis extends in a first direction including one side and other side,

the illumination light incidents the first optical system from the one side to the other side, and

in a side vide, the second holding member includes a part protruding from the other side to the one side.

10. The projection lens according to claim 2, wherein the lens barrel is rotationally movable relative to the housing.

11. The projection lens according to claim 3, wherein the lens barrel is rotationally movable relative to the housing.

12. The projection lens according to claim 4, wherein the lens barrel is rotationally movable relative to the housing.

13. A projector comprising:

the projection lens according to claim 1; and

the housing.

14. The projector according to claim 13 further comprising:

wherein the lens barrel is a U-shaped barrel that includes a first holding member holding the first optical system, a second holding member holding the second optical system, and a joint portion joining the first holding member to the second holding member, and

relationships of “

H1<

R1” and

“

W<

R1”

are satisfied in a case in which a distance between the first optical axis and an upper end of the housing in an up-down direction of the housing orthogonal to the first optical axis is denoted by H1, a distance between the first optical axis and one side surface of the housing in a lateral direction of the housing orthogonal to the first optical axis and the up-down direction is denoted by W, and a distance between the first optical axis and a portion of the second holding member, which is closest to the first optical axis, is denoted by R1 in an interference region where the second holding member housing the second optical system protrudes toward the housing from the barrel-mounting surface.

15. The projector according to claim 13,

wherein the housing includes a corner where the upper end and the one side surface cross each other, and

a relationship of “

L<

R1”

is satisfied in a case in which a distance between the first optical axis and the corner is denoted by L.

16. The projector according to claim 13,

wherein relationships of “

R2<

H1” and

“

R2<

H2”

are satisfied in a case in which a distance between the first optical axis and a lower end of the housing in the up-down direction is denoted by H2 and a distance between the third optical axis and a maximum outer diameter of the second holding member in a radial direction is denoted by R2.

17. The projector according to claim 13,

wherein the angle adjustment unit supports the lens barrel so that the lens barrel is rotationally movable relative to the housing.

18. The projector according to claim 14,

wherein the angle adjustment unit supports the lens barrel so that the lens barrel is rotationally movable relative to the housing.

19. The projector according to claim 15,

wherein the angle adjustment unit supports the lens barrel so that the lens barrel is rotationally movable relative to the housing.

20. The projector according to claim 16,

wherein the angle adjustment unit supports the lens barrel so that the lens barrel is rotationally movable relative to the housing.