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Aperture board

A technology of aperture plates and aperture openings, applied in apertures, optics, instruments, etc., can solve problems such as increased manufacturing costs, insufficient shading properties, etc., and achieve the effects of suppressing halos, reducing flash or ghosting, and suppressing reflections

Inactive Publication Date: 2006-03-08
FUJI PHOTO OPTICAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, in the diaphragm plate described in Patent Document 1, after preparing two plates by pressing (press) processing, etc., it is necessary to perform high-precision work with an adhesive to align the centers of the openings. This process will increase the manufacturing cost.
In addition, since the thickness of the thin plate forming the diaphragm opening is 0.04 to 0.09mm, it is very thin, so there is about 5% light transmission around the diaphragm opening that does not overlap with the thick plate, so the light-shielding property is not sufficient.

Method used

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Examples

Experimental program
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Embodiment Construction

[0023] Hereinafter, specific embodiments of the present invention will be described in detail.

[0024] figure 1 A mobile phone with a camera incorporating the aperture plate of the present invention is shown. Such as figure 1 As shown in (a), the upper part of the mobile phone 2 with a camera is equipped with a communication antenna 4, and the upper part of the surface is equipped with a receiver 5 for outputting the voice of the person to be called, a liquid crystal screen 7 for displaying images, and various operations such as inputting a telephone number. The operation button 9, the microphone 11 that transmits the voice to the other party, etc. figure 1 (b) represents a perspective view of the inside of a mobile phone with a camera. A first lens 24 provided in a lens unit described later emerges from the inside of the camera-equipped mobile phone 2 . The mobile phone 2 with a camera can switch modes between the call mode for making calls and the camera mode for shooti...

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Abstract

To provide a diaphragm plate which has sufficient strength and doesn't transmit light and suppresses the occurrence of flare and ghost. A diaphragm plate 28 is made of, for example, phosphor bronze or stainless steel. The diaphragm plate 28 comprises a first tabular portion 28a having a diaphragm aperture 35 formed therein and a second tabular portion 28b formed surrounding the periphery of the first tabular portion 28a. The first tabular portion 28a is made thinner than the second tabular portion 28b. An entrance peripheral portion 35d and an exit peripheral portion 25e are formed in an inner peripheral surface 35c of the diaphragm aperture 35. The entrance peripheral portion 35d and the exit peripheral portion 25e are formed circularly. Therefore, the diameter of the diaphragm aperture 35 is made gradually larger according as going toward an entrance 35a and an exit 35b. The inner peripheral surface 35c is coated with a paint preventing reflection of light.

Description

technical field [0001] The present invention relates to an aperture plate assembled in a lens barrel together with an optical system such as a photographic lens and used. Background technique [0002] A diaphragm is incorporated in a lens unit of a camera or the like. Assembled in the aperture of the lens unit, a variable aperture that can adjust the opening diameter according to the brightness is commonly used, for example, a simple camera such as a film (disposable camera) unit with a lens or a simple digital camera assembled in a mobile phone There are also lens units without an iris. There is a lot of light that has nothing to do with shooting incident on the lens unit, resulting in flare or ghost image, which reduces the quality of the captured image. Therefore, the lens unit of the above-mentioned simple camera can prevent harmful light. The incident, and can set the F number of the lens with a constant aperture diameter fixed aperture. [0003] Conventionally, thes...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03B9/02
CPCG03B9/04G03B29/00
Inventor 奥村哲也
Owner FUJI PHOTO OPTICAL CO LTD
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