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Light control apparatus

A light adjustment and incident light technology, applied in the direction of aperture, optics, camera, etc., can solve the problems of light adjustment part movement, camera equipment impact, etc.

Active Publication Date: 2016-07-13
OLYMPUS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, there are cases where a sudden shock is applied to an imaging device equipped with a light adjustment device, etc.
In this case, with the configuration described in the aforementioned Japanese Patent Application Laid-Open No. 9-22042, the light adjustment unit as the movable body may move to a position different from the intended position.
In particular, when the light adjustment device is in a non-driven state, that is, when the coil is not in a power-off state where no current flows through the coil, there is no force applied to the permanent magnet and the light adjustment part, so the light adjustment part is prone to unintended actions such as impacts. while moving
In addition, when the designed magnetic force or the like is not generated from the coil, the light adjustment part may stop in the middle of the path to be moved, and may not retract to a predetermined position.

Method used

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Experimental program
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Embodiment approach 1

[0027] Figure 1 to Figure 10 Embodiment 1 of the present invention is shown.

[0028] First, refer to Figure 1 to Figure 6 , the basic configuration and function of the light adjustment device will be described. here, figure 1 is a perspective view showing the configuration of the light adjustment device, figure 2 It is an exploded perspective view showing the structure of the light adjustment device stretched along the optical axis direction, image 3 is a perspective view showing the configuration of the light adjustment device when the light adjustment unit is at the withdrawn position, Figure 4 is a perspective view showing the configuration of the light adjustment device when the light adjustment unit is in the insertion position, Figure 5 It is a diagram showing the polarity direction of the rotating shaft member and the magnetization of the electromagnetic drive source when the light adjustment unit is in the retracted position, Figure 6 It is a diagram show...

Embodiment approach 2

[0065] Figure 11 to Figure 14 Embodiment 2 of the present invention is shown, Figure 11 is a diagram showing a situation where the light regulator 7 is in the retracted position when no current is passed through the coil 5, Figure 12It is a figure which shows the state which the light adjustment part 7 is in the insertion position, when no electric current flows through the coil 5.

[0066] In this Embodiment 2, the same code|symbol etc. is attached|subjected to the same part as Embodiment 1 mentioned above, and description is abbreviate|omitted suitably, and only a different point is mainly demonstrated.

[0067] The present embodiment is configured so that even if the rotating shaft member 6 moves to a certain position within the rotatable range θa due to an external force such as an impact when no current flows through the coil 5 , it always returns to the retracted position.

[0068] Furthermore, the configuration of the light adjusting device is substantially the sam...

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PUM

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Abstract

A light control apparatus that has a substrate, a rotary shaft member comprising an axial magnet, a light adjustment unit that rotates integrally with the rotary shaft member, and an electromagnetic drive source for driving the rotary shaft member using a coil and a coil core comprising a magnetic body, and control apparatus controls light by moving the light adjustment unit to a retracted position and an inserted position, wherein a rotatable range [theta]a is set so as to have a part that overlaps with a range [theta]n that results in a negative direction in the torque acting on the rotary shaft member as a result of magnetic force when the coil is de-energized and / or a range [theta]p that results in a positive direction, and additionally, [theta]a is set so that the range [theta]1 thereof overlapping with [theta]n and the range [theta]2 thereof overlapping with [theta]p have different widths.

Description

technical field [0001] The present invention relates to a light adjusting device which adjusts light by inserting or detaching a light adjusting part on an optical path. Background technique [0002] Imaging devices having an imaging function are widely used in various fields, but there is also a field of compact imaging devices having a relatively small shape among them. Some examples of such small-sized imaging devices include electronic endoscopes including microendoscopes, optical microscopes equipped with imaging functions, and portable devices equipped with imaging functions. [0003] Conventional compact imaging equipment uses fixed focus lenses, fixed aperture stops, fixed characteristic filters, etc. as optical elements such as lenses, diaphragms, and optical filters in order to prioritize miniaturization. [0004] On the other hand, in recent years, such small-sized imaging equipment has also been required to have higher image quality. As the optical elements of t...

Claims

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Application Information

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IPC IPC(8): G03B9/02
CPCG03B9/02G03B2205/0069
Inventor 高桥雅矢
Owner OLYMPUS CORP