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Aperture apparatus

A technology of aperture and aperture blade, applied in aperture, optics, camera, etc., can solve the problems of difficulty in miniaturization of devices, hindering the miniaturization of devices, and enlargement of aperture blades, etc.

Active Publication Date: 2011-11-16
OM DIGITAL SOLUTIONS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] However, in the optical path opening and closing device of Japanese Patent Laid-Open No. 2007-163827, since it is necessary to cover the cam groove portion entering the optical path opening with other aperture blades, the shape of the aperture blades must be increased, which hinders the miniaturization of the device. main reason
In addition, since it is necessary to avoid interference with a cam follower that fits into a cam groove of another diaphragm blade, it becomes difficult to reduce the size of the device if the shape of the diaphragm blade is enlarged.

Method used

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Embodiment Construction

[0027] Hereinafter, one embodiment of the present invention will be described using the drawings.

[0028] figure 1 is a perspective view showing the structure of the diaphragm device, figure 2 yes figure 1 An exploded perspective view of the aperture device, image 3 is a plan view showing the structure of the aperture blades, Figure 4 is a plan view for explaining the rotation of the diaphragm blades, Figure 5 is a plan view showing the aperture blades in the most open state, Figure 6 is shown from Figure 5 Rotate a predetermined angle toward the closing direction, thereby specifying the plan view of the aperture blades in the state of the first intermediate aperture, Figure 7 is shown from Figure 6 Rotate a predetermined angle toward the closing direction, thereby specifying the plan view of the aperture blades in the state of the second intermediate aperture, Figure 8 is shown from Figure 7 Rotate a predetermined angle toward the closing direction, thereb...

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Abstract

The invention provides an aperture apparatus. The aperture apparatus 1 has mutual overlapped a plurality of aperture blades 6, when the first aperture blade 6a enters in the light beam of the shot object, a second aperture blade 6b is used to perform lightproof operation to the first cam groove 22a of the first aperture blade 6a, and the aperture apparatus has a third aperture blade for performing lightproof operation to the residual part of the cam groove 22a that has not been completely proofed by the second aperture blade 6b. According to the aperture apparatus, even if a plurality of aperture blades formed with cam grooves are reduced, along with the reduction of aperture diameter, lightproof operation completely can be performed to the cam groove increased to the entering amount entering in the light path opening, and miniaturization can be realized.

Description

technical field [0001] The present invention relates to a diaphragm device arranged in an optical device and including a plurality of diaphragm blades that change the amount of passing light by displacement. Background technique [0002] Conventionally, as a diaphragm device arranged in an optical device such as a camera, a diaphragm device in which cam grooves are formed on a plurality of diaphragm blades rotatably arranged on a support shaft, and a cam groove is provided on a rotating member to engage the cam is known. The cam follower of the groove, through the rotation of the rotating member, the multi-piece diaphragm blades adjust the opening amount of the optical path. In addition to this kind of diaphragm device, there is also known a cam groove formed on the rotating member side and snapped into the cam follower. The cam follower of the cam groove is provided in a diaphragm device or the like of a plurality of diaphragm blades. [0003] For such a variety of apertur...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G03B9/06G03B9/02
Inventor 矢野友秀
Owner OM DIGITAL SOLUTIONS CORP