JP4230854B2 - Lens protector - Google Patents

Description

  The present invention relates to a lens protection device that is mounted on a camera or the like to protect a lens.

  In a camera with a barrier attached to the cabinet to protect the lens, if there is little space for the barrier to save, conventionally, the barrier has a two-blade structure and can be stored in layers or saved to the left and right to save space Measures such as doing are taken. However, since the conventional technology is configured such that the barrier moves laterally, many mechanical parts such as a rack, a pinion, and a lever are required. Therefore, the number of parts is large, the cost is high, and a space for storing the mechanism portion is necessary.

  For example, a plurality of movable barrier devices that open and close in a direction orthogonal to the optical axis at the lens opening at the front end of the lens barrel cover, the moving direction rack, a gear meshing with the rack, a drive rack, and an operation member (For example, refer to Patent Document 1). This technology is said to be suitable for small and lightweight cameras with a small mounting space and a small number of parts, but it is well suited for miniaturization, such as moving to a position where the rack protrudes when the lens opening is open. I can't say that. In addition, many mechanical parts such as a plurality of racks, pinions, and gears are required.

A sphere having the same shape of the two-divided barrier and the receiving plate, including a two-divided barrier, a connecting lever for connecting the barrier, a holding portion for holding the barrier in an open position or a closed position, and a receiving plate that forms a moving space. There is a barrier device that is part of a spherical shell with a heart (see, for example, Patent Document 2). This device is simple in structure, has a small number of parts, is compact, can prevent the barrier from being stopped midway, and can be stably held in the open position, satisfying the high-class feeling of operation, durability, and functionality. It is said to be a thing. This device is a manual device in which the barrier moves horizontally, requires parts such as a link and a return spring, and requires a large horizontal space.
Utility Model Registration No. 2593878 Japanese Patent Laid-Open No. 5-216092 (see paragraph 0007)

  An object of the present invention is to develop and provide a lens protection device that is space-saving and simple in mechanism as compared with the above-described conventional technology.

The present invention has been made to solve the above-mentioned problems, and is a lens protection device characterized by taking the following technical means. That is, the present invention provides a lens protection device that covers the lens opening of the cabinet having an opening through which the lens is exposed, so that the lens can be opened and closed.
A lens protection device comprising: a lens protection barrier comprising two barrier blades that are pivotally mounted around one axis and share and cover the lens opening, and are retreated from the lens opening and overlap each other It is.

  In the present invention, the driving of the two-blade barrier is a coaxial turning system, and the mechanical parts are suppressed to a minimum by simplifying the structure.

  Here, in the lens protection device of the present invention, it is preferable that the cabinet includes a turning guide that guides the turning of one barrier blade, and the one barrier blade is a member of the other barrier blade. It is preferable to have a configuration including a turning guide for guiding the turning.

  In this way, it is possible to make the barriers into two blades even if they come off from the guide of the cabinet along the rotation trajectory, and the advantageous barrier mechanism is configured in terms of cost and space Is done.

  In the lens protection device of the present invention, the two barrier blades include a half-moon-shaped barrier blade covering a part of the lens opening, and a defect portion where the lens opening cannot be covered by the one barrier blade. It is preferable that it is composed of the other barrier blade having a shape.

  Furthermore, it is preferable that the lens protection device of the present invention includes a driving device for turning the two barrier blades around the axis, and thus the barrier blades can be automatically opened and closed.

  Since the lens protection device of the present invention is configured as described above, the mechanism and structure are simple, the required space is small, the number of parts is small, the operation is reliable, and the excellent effect of contributing to cost reduction. Play.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 is an exploded perspective view of a camera showing a lens protection device according to an embodiment of the present invention, in which only a front cabinet of the camera is viewed from the back side. FIG. 1 shows a state before the barrier 10 and its driving device 31 are attached to a cabinet. FIG. 2 is a rear view showing a state in which the barrier 10 is assembled to the cabinet 2, and FIG. 3 is a front view of the camera 1 showing a closed state of the barrier 10. FIG. 4 is a front view of the camera 1 showing the open state of the barrier 10 as seen through.

  In the lens protection device of the present invention, the lens protection barrier 10 is divided into two blades 11 and 12. The two blades 11 and 12 are composed of, for example, a half moon and a missing portion thereof, and it is preferable that the half moon side (the blade 12) is formed slightly larger. As shown in FIG. 3, the two blades 11 and 12 are adjacent to form a circular barrier 10 when covering the lens, and when the lens is opened, one meniscus ( The barrier (blade 11) of the other missing part is stored in the blade 12). An imaging lens (not shown) is provided in the cabinet 2 at a position corresponding to the lens opening 3, and when the two blades 11 and 12 are opened, the imaging lens is exposed from the lens opening 3. When the blades 11 and 12 are closed, the front surface of the lens is covered. The two blades 11 and 12 rotate around the same shaft 13. The turning range is a position completely covering the lens opening 3 and a position deviating from the lens opening 3. The two blades 11 and 12 are attached to a turning center shaft 13 so as to turn freely. The tip of the revolving blade is guided by the turning guide. Of the two divided blades 11 and 12, the turning guide 21 of one barrier blade 12 is attached to the cabinet 2. The turning guide 22 of the other barrier blade 11 is provided along the blade surface of the one barrier blade 12.

  FIG. 5 is a perspective view showing a barrier and a driving device for driving the barrier.

  The drive device 30 is provided with a motor 31, and the motor 31 rotates the output shaft 32 through several gears. In addition, a rotation center shaft 13 that is the center of rotation of the barrier is attached to the drive device.

  On the other hand, a turning center hole 14 is provided in the barrier to be a turning center through which the turning center shaft 13 penetrates. The turning center hole 14 is provided in both of the two barrier blades 11 and 12, and the turning center hole 14 provided in both of the barrier blades 11 and 12 is overlapped so as to communicate with each other. 13 penetrates into the pivot center holes 14 of both of them.

  The barrier blade 12 is provided with a fan-shaped opening 15, and the other barrier blade 11 is provided with a substantially rectangular drive opening 16 that overlaps the fan-shaped opening 15 and into which the output shaft 32 is fitted. .

  The output shaft 32 fits into the drive opening 16 and also enters the fan-shaped opening 15. When the output shaft 32 is driven, the barrier blade 11 swivels around the swivel center shaft 13 as the output shaft 32 rotates, When the drive opening 16 reaches one end of the fan-shaped opening 15, the barrier blade 12 then rotates together with the barrier blade 11.

  As shown in FIG. 4, the width of the fan-shaped opening is such that the two barrier blades 11 and 12 jointly cover the lens opening 3 and the barrier blade 11 overlaps the barrier blade 12 as shown in FIG. 4. It is decided to be in both states.

  This drive mechanism has a small number of parts, a simple assembling process, and has an extraordinary effect compared to the prior art in terms of space saving.

It is a disassembled perspective view which shows the lens protection apparatus of the Example of this invention. It is a rear view of the lens protection device of the assembled example. It is a front view of the camera which shows a barrier closed state. It is a front view of the camera which shows through the barrier open state. It is a perspective view which shows the barrier and the drive device which drives the barrier.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Camera 2 Cabinet 3 Lens opening 10 Lens protection barrier 11, 12 Barrier blade 13 Turning center axis 14 Turning center hole 15 Fan-shaped opening 16 Driving opening 21, 22 Turning guide 30 Driving device 31 Motor 32 Output shaft

Claims (5)

In the lens protection device that covers the lens opening of the cabinet having the opening through which the lens is exposed, so as to be freely opened and closed,
A lens protection barrier comprising two barrier blades that are pivotably mounted around one axis and share and cover the lens aperture and overlap each other by retreating from the lens aperture;
The cabinet includes a turning guide for guiding the turning of only one barrier blade,
A lens protection device, wherein the one barrier blade includes a turning guide provided along the outer periphery of the blade surface of the one barrier blade to guide the turning of only the other barrier blade.   The two barrier blades are composed of one barrier blade that covers a part of the lens opening and the other barrier blade that has a shape of a defective portion that cannot cover the lens opening with the one barrier blade. The lens protection device according to claim 1, wherein the lens protection device is provided.   3. The lens protection device according to claim 2, wherein the other barrier blade overlaps with the one barrier blade and is accommodated in the one barrier blade when retracted from the lens opening.   The one barrier blade is a barrier blade having a curved side along the peripheral edge of the lens opening, and the curved side is arranged along the peripheral edge of the lens opening when retracted from the lens opening. The lens protection device according to claim 2, wherein:   The lens protection device according to claim 1, further comprising a driving device for turning the two barrier blades around the axis.

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