JPH04104635U - camera lens barrier device - Google Patents

Abstract

(57) [Summary] [Purpose] To miniaturize a camera lens barrier device. [Structure] Two barrier members each having a spherical shape divided into two are pivotally supported so as to be able to swing, and are connected by a link member so that the respective swings are interlocked in opposite directions.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

The present invention relates to a lens barrier device for a camera.

0002

[Issues to be solved by conventional technologies and ideas]

Traditionally, cameras with a retractable lens barrier on the front of the photographic lens were well known. Many of the common configurations use flat plate-shaped barrier members. . These two flat barrier members are configured to be slidable, and in the closed position. are in the open position, with their edges butting against each other just in front of the photographic lens. In this case, move away from the optical path area of the photographic optical system to the outside in the radial direction of the lens barrel, and set the positions on the opposite sides. It is in.

0003 On the other hand, a recent trend in so-called compact cameras is that the photographic lens has a variable focal length. In addition, lenses are becoming wider, and the optical path of photographic optical systems is expanding accordingly. Therefore, the diameter of the front opening that should be covered by the barrier has increased. For such cameras, When adopting a lens barrier with a two-plate structure like this, the front opening has a large diameter. In addition, it is necessary to secure escape space for the barrier member radially outward of the lens barrel. If this is provided in the lens barrel, the diameter of the lens barrel in the entire camera will inevitably increase.

0004 In addition, as one of the prior art technologies closest to the present invention, it was published by Photo Kogyo Publishing Co., Ltd. Page 80 in the September 1988 issue of the magazine "Photography Industry" published on September 1, 1963. For example, the technique described in the article on page 87 of In this conventional technology , a spherical barrier member (lens cover) consisting of one member is used; By swinging the barrier member around the axis along the spherical surface, the photographic optical system can be adjusted. Opens and closes the optical path. However, with this conventional technology, the burr is removed at the optical path open position. This has the disadvantage that the storage space for the housing member becomes longer in the optical axis direction. In other words, the lens barrel As for the size of the part, the diameter is somewhat smaller than when using a flat barrier member. Yes, but it requires a long storage space in the axial direction.

[0005] This invention was developed in view of the conventional technical issues regarding lens barriers as mentioned above. It was devised to effectively solve the problem. Therefore, the purpose of this invention is to When installing a lens barrier in the A cover that can minimize the need for lens barrel diameter and optical axis length. The purpose of the present invention is to provide a camera lens barrier device.

[0006]

[Means to solve the problem]

The camera lens barrier device according to the present invention covers the optical path of the photographing optical system in an openable manner. It is preferably provided on the front of the photographic lens, and is formed into a roughly spherical shape and divided into two parts. a spherical shape of the rear member and the barrier member that is approximately orthogonal to the optical axis of the photographic lens; a support that rotatably supports the two barrier members by a common axis passing approximately through the center of the A mechanism is connected between the two barrier members, and the two barrier members are connected to each other's edges. a first position where they butt against each other to close the optical path of the photographing optical system, and a first position where the two burrs A second position in which the a member separates the edges of each other to open the optical path of the photographing optical system. a coupling mechanism that guides and restricts rotation of the two barrier members in opposite directions between the two barrier members; It is equipped with

[0007] Further, the connecting mechanism is a link that constitutes a four-bar mechanism together with the two barrier members. a link member, each of the link members having one end connected to one end of each of the barrier members; The other end of each of the two ends is rotatably connected to the The shadow optical system may be supported so as to be able to reciprocate in parallel to the optical axis, and furthermore, the above two The barrier member may include biasing means for biasing the barrier member toward the second position.

[0008]

[Effects of action and invention]

In the camera lens barrier device according to the present invention, a roughly spherical shape is divided into two parts. The formed barrier member slides along its spherical surface to open and close the photographic optical system. Do it by moving. This movement is opposite to each other around the common axis of both barrier members. This is done by rocking in opposite directions. This constant rocking motion is planned by the coupling mechanism. Internally regulated. Therefore, both barrier members have their respective edges abutted against each other. The photographic optical system is closed in the first position, and the photographic optical system is closed in the second position with the respective edges separated. to open.

[0009] Since both barrier members swing along the spherical surface, the space they occupy in the second position is The space occupied by a conventional flat barrier member is located at a position retracted from the optical path of the photographic optical system. The diameter of the lens barrel can be made smaller than PACE. Furthermore, the barrier member itself has a spherical shape. Because it is divided into two parts, the lens barrel is smaller than when forming a spherical barrier member with one member. The barrier storage space in the optical axis direction can be reduced.

0010 In particular, the connecting mechanism is a link member that constitutes a four-bar mechanism together with the barrier member. In some cases, for example, compared to a coupling mechanism using a gear member that requires a certain degree of face width dimension. Therefore, the mechanism itself can be made thinner.

[0011]

【Example】

Refer to FIGS. 1 to 3 below for a lens barrier device according to an embodiment of the present invention. I will refer to and explain. In FIG. 1, 1 is a casing that houses and supports a pair of barrier members 2 and 3. It is formed into a roughly cylindrical shape. In Figure 1, only casing 1 passes through the axis. Shown in cross section. The back side of casing 1 (right side in the figure) is open. The back side of the lens is fixed to the tip of a lens barrel (not shown). On the front of casing 1, An aperture 4 is formed to open the optical path of the photographing optical system. This opening 4 is tentatively shown in Figure 2. As shown by the imaginary line, it is formed into a roughly rectangular shape with a smooth curve. The peripheral edge and the end face facing into the casing 1 are shaped so as to be in contact with a spherical surface of constant curvature. It is formed like a sea urchin. This constant curvature is the curvature of the outer peripheral surface of the pair of barrier members 2 and 3. is roughly equal to .

0012 The pair of barrier members 2 and 3 have spherical parts 5 and 6. and 6 open and close the opening 4. Both ends of the spherical parts 5 and 6 of each barrier member 2, 3 Arm portions 7, 8, 9, and 10 are formed in the. These arm parts 7, 8, 9, 10 are Each is formed into a parallel flat plate shape, with each end facing the radial direction of the casing 1. It is rotatably supported by support shafts 11 and 12. The support shaft 11 is The optical axis of the optical system is in a positional relationship perpendicular to each other, and the common part of each spherical part 5 and 6 is This support structure allows the barrier members 2 and 3 to swing to open the opening 4. Open and close.

[0013] Each of the arm portions 7 and 8 on one side is provided with a pair of barrier members 2 and 3. Link members 12 and 13 are connected to each other for interlocking the rocking movements of the two. These links The members 12 and 13 have the same length, and one end of each rotates around the connecting shaft 14. They are movably connected, and each other end is connected to approximately the middle portion of each arm portion 7,8. From the connection point of each link member 12, 13 and each arm part 7, 8 to the axis of both arm parts 7, 8 The distances to the fulcrums are equal to each other. In other words, the two arm parts 7 and 8 and the two links The hook members 12 and 13 form a pantograph-like four-bar mechanism. .

[0014] A connecting shaft 14 that connects both link members 12 and 13 to each other has one end connected to the casing 1. The projecting end 15 is parallel to the optical axis of the photographing optical system. It is possible to move there and back. The case guides the reciprocating movement of the protruding end 15. There are two protrusions 16 and 17 formed on the inner peripheral surface of the thing 1, and the protruding end 15 is It slides between the protrusions 16 and 17. The protruding end 15 opens the opening 4 between the protrusions 16 and 17. When moving to the side, the barrier members 2 and 3 swing in the direction of closing the opening 4, and the protruding end 15 When the barrier members 2 and 3 move in the opposite direction, the barrier members 2 and 3 also move in the opposite direction, that is, the opening 4 opens. It swings in the opposite direction.

[0015] A string spring 18 is attached to the shaft support of the arm portions 9 and 10 on the other side, and both burrs The opening members 2 and 3 are biased in the opening direction. The arm portion 10 also includes a barrier member 2, A pin portion 19 protrudes that receives the driving force for the opening/closing operation of No. 3. This pin part 1 Although not shown, the action and release of the driving force on 9 is provided in the camera body. This is done by operating the barrier opening/closing operation member. The direction of action of the driving force is determined by the shooting light. It is approximately parallel to the optical axis of the optical system.

[0016] In the lens barrier device configured as described above, a driving force acts on the pin portion 19. The barrier member 3 and the link member 13 are moved forward along the optical axis via the arm portion 10. (to the left in FIG. 1), the protruding end 15 of the connecting shaft 14 is pushed between the protrusions 16 and 17. to slide forward. In this series of operations, the link member 12 and the arm section 9 are interlocked and both barrier members 2 and 3 perform a closing operation at the same time. Both barrier members 2 and 3 are As shown in Figure 3, the optical path of the photographic optical system is closed with the opposite edges butted against each other. It also covers the front of the photographic lens inside the lens barrel. On the other hand, when the driving force acting on the pin member 19 is released, the helical spring 18 Both barrier members 2, 3 open to both sides due to the biasing force, and each link member 12, 13 and its connection The connecting shaft 14 follows this movement. This allows the optical path of the photographic optical system to be in front of the photographic lens. It is opened along with the surface.

[Brief explanation of drawings]

FIG. 1 is a partially cutaway side view showing a lens barrier device according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along the line II-II in FIG. 1;

3 is a diagram illustrating a state in which the barrier member is in a closed position in the embodiment of FIG. 1. FIG.

[Explanation of symbols]

2,3 Barrier material 11 Support shaft as a support mechanism 12,13 Link member as a connection mechanism 18 String spring as biasing means

Claims (3)

[Scope of utility model registration request] Claims: 1. A barrier member (2, 3) which is provided on the front surface of the photographic lens to releasably cover the optical path of the photographic optical system and is divided into two parts each having a roughly spherical shape, and an optical axis of the photographic lens. The two barrier members (2, 3) are connected by a common axis that is approximately perpendicular to
A support mechanism (11) that rotatably supports (2, 3) and the two barrier members (2, 3) are connected, and
A first position where the two barrier members (2, 3) butt their edges to close the optical path of the photographing optical system;
and a second position where the two barrier members (2,
3) to guide and restrict rotation in the opposite direction (12,
13) A camera lens barrier device comprising: 2. The connection mechanism connects the two barrier members.
These are link members (12, 13) that constitute a four-bar mechanism together with (2, 3), and each of the link members (12, 13) has one end connected to one end of each barrier member (2, 3). Claim 1: The optical system is movably connected, and each other end is rotatably connected together and supported so as to be reciprocating in parallel to the optical axis of the photographing optical system.
Lens barrier device for the camera described. Claim 3: The two barrier members (2, 3) are connected to the second barrier member (2, 3).
2. A lens barrier device for a camera according to claim 1, further comprising biasing means (18) for biasing in the direction of the position.