JP4556249B2 - Optical equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an optical device, and more particularly, to an image input device that converts an optical image into an electrical signal, an optical device such as an electronic camera, and the like for an image input with dust or the like attached to the surface of a photoelectric conversion element such as a CCD The present invention relates to an optical device capable of preventing occurrence of reflection.
[0002]
[Prior art]
A digital still camera capable of exchanging a photographic lens with a single-lens reflex camera (hereinafter, a digital still camera capable of exchanging a photographic lens with a single-lens reflex camera is referred to as a “lens interchangeable DSC”. Known as “DSC”). In the interchangeable lens type DSC, foreign matter such as dust and scratches easily enters the mirror box when the photographing lens is removed.
[0003]
In addition, since a mechanism for controlling the apertures of the mirror and the taking lens operates in the mirror box, dust may be generated inside the mirror box.
[0004]
If these foreign substances adhere to the vicinity of the focal plane of the photographing lens, that is, the vicinity of the light receiving surface of a photoelectric conversion element such as a CCD, the image input by the photoelectric conversion element may be reflected. Hereinafter, in the present specification, occurrence of a shadow of a foreign object in an input image is simply referred to as “occurs a reflection”.
[0005]
The same applies to image input devices such as facsimiles and scanners. When an original is sent or when the original reading unit moves, foreign matter such as dust and debris is generated, which is generated near the light receiving surface of the photoelectric conversion element and on the glass for placing the original. If it adheres to (platen glass) or the like, reflection may occur as in the case of the interchangeable lens DSC.
[0006]
[Problems to be solved by the invention]
In order to eliminate such inconveniences, in the interchangeable lens DSC, it is common to use a blower or the like to blow off foreign matter adhering to the surface of the photoelectric conversion element or the like and perform cleaning.
However, the blown-out foreign matter may not come out of the camera and adhere to the inside of the mirror box. The same applies to optical devices such as facsimiles and scanners, and there are cases where blown-off foreign matter does not come out of the optical device and remains inside the device.
[0007]
  By the way, the DSC is provided with an optical filter for controlling the spatial frequency characteristics in the vicinity of the photoelectric conversion element. This optical filter uses a crystal such as a quartz plate having birefringence characteristics. Since these crystals have a piezoelectric effect, the crystals themselves are easily charged by vibration or the like, and the charged charges are difficult to escape. In addition, the material of the photoelectric conversion element package is plastic or ceramics.InsulationSince the material is used, there is a background that electric charges are difficult to escape when the photoelectric conversion element is charged.
[0008]
In some cases, the above-mentioned foreign matter floats in the equipment due to vibrations or air flow generated by the operation of the equipment, and this adheres again to the optical filter or photoelectric conversion element charged as described above. As a result, reflections occurred again, and it was necessary to frequently clean the optical equipment.
[0009]
The present invention neutralizes charges generated as the above-described optical filter and photoelectric conversion element are charged, and suppresses foreign matter from adhering to these optical filter and photoelectric conversion element to cause reflection. The purpose is to do.
[0010]
[Means for Solving the Problems]
  The following invention will be described with reference to FIGS. 1 and 2 showing an embodiment.
(1) The invention according to claim 1 is a photoelectric conversion means 5 for converting an optical image formed by the imaging lens 1 into an electric signal; a seal glass 5a formed on an incident surface of the photoelectric conversion means 5; In the optical path between the imaging lens 1 and the seal glass 5a, Provide a space between the seal glass 5aAn optical member 4 disposed; an optical member 4 positioned at least in the vicinity of the imaging surface of the imaging lens 1;Entrance surface and exit surfaceA transparent electrode 8B provided on the optical member 4; and a conductive member 6a that is electrically connected to the transparent electrode 8B and neutralizes charges generated in the optical member 4 by charging.
(2The description will be made with reference to FIG. 4 showing an embodiment.2The invention described in 1 further includes a voltage source 20 for applying a voltage to the conductive member 6aA so as to reduce the adsorbing force of the deposits adhering to the optical member 4.
  The following invention will be described with reference to FIG. 5 showing an embodiment.
(3Claim3In the invention described in 1), a shutter 3 that can be switched to a light-blocking state that blocks a light beam incident on the photoelectric conversion means 5 or an open state that allows the light beam to pass therethrough is disposed on the incident surface side of the optical member 4; With respect to the positional relationship with the member 4, the optical member 4 is disposed close to the position where the optical member 4 is charged with the operation of the shutter 3.
(4Claim4The invention described in 1 further includes a voltage source 30 for applying a voltage to the conductive members 68 and 6aA so as to reduce the adsorbing force of deposits adhering to the optical member 4.
(5Claim5The invention described in 1 further includes an operation mode in which the shutter 3 is maintained in an open state and a voltage is applied to the optical member 4.
(6Claim6The invention described in claim5The voltage source is controlled so that a voltage is applied to the conductive member in accordance with a user's manual operation.
[0011]
In the section of the means for solving the above-described problems for explaining the configuration of the present invention, the drawings of the embodiments of the invention are used for easy understanding of the present invention. It is not limited.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
− First embodiment −
FIG. 1 is a diagram schematically showing a main part of an interchangeable lens DSC to which the present invention is applied (hereinafter, the interchangeable lens DSC is simply referred to as “camera” in the present specification). An interchangeable photographic lens 1 is mounted on the camera body 40 according to the purpose of photographing. Inside the mirror box 42 of the camera body 40, a mirror 2, a shutter 3, an optical filter 4, a photoelectric conversion element 5, and the like are disposed. A focusing screen 10 is disposed above the mirror box 42.
[0013]
The mirror 2 is automatically switched between a down state, that is, a state indicated by a solid line in FIG. 1 and an up state, that is, a state indicated by a two-dot chain line in FIG. The shutter 3 controls the amount of light incident on the light receiving surface of the photoelectric conversion element 5 disposed with the optical filter 4 behind the shutter 3. The optical filter 4 is configured by superposing an optical low-pass filter formed of a crystal such as quartz having birefringence characteristics, a filter for cutting light in the infrared wavelength region, a quarter wavelength plate, and the like.
[0014]
The description of the first embodiment will be continued with reference to FIG. 2 in which the arrangement of the optical filter 4 and the photoelectric conversion element 5 of the camera shown in FIG. 1 is enlarged. Transparent electrodes 8A and 8B such as a nesa film are formed on the incident surface and the exit surface of the optical filter 4, respectively. A seal glass 5a is provided on the light receiving surface of the photoelectric conversion element 5, and a transparent electrode 8C such as a nesa film is also formed on the surface of the seal glass 5a. These transparent electrodes 8A to 8C are connected to a conductive portion of the housing 7 by a conductive connection portion 6a or 6b as described later.
[0015]
With reference to FIG. 3 in which the optical filter 4 and the housing 7 are partially enlarged, the conductive connection portion 6a between the transparent electrodes 8A and 8B formed on the surface of the optical filter 4 and the housing 7 will be described. . In FIG. 3A, the optical filter 4 has a through hole 4a. A conductive pin 61 is inserted into the through hole 4a, and the pin 61 and the transparent electrodes 8A and 8B are bonded to each other with a conductive adhesive 60 such as silver paste. Thereby, the pin 61 and transparent electrode 8A, 8B will be in a conduction | electrical_connection state. One end of the wire 62 is soldered to the pin 61 and the other end is soldered to the conductive portion of the housing 7. When connecting the wire 62 and the conductive portion of the housing 7, a lug plate or the like (not shown) is soldered or pressure-bonded to the wire 62, and the lug plate or the like is screwed to the housing 7. There may be. Thereby, the transparent electrodes 8A and 8B are connected so as to be equipotential with the conductive portion of the housing 7. As described above, in the example illustrated in FIG. 3A, the conductive connection portion 6 a </ b> A is configured by the conductive adhesive 60, the pin 61, and the wire 62.
[0016]
The conductive connection portion between the transparent electrodes 8A and 8B and the conductive portion of the housing 7 may be as shown in FIG. 3B or FIG. 3C, which will be described below. In FIG. 3B, the conductive members 64 </ b> A and 64 </ b> B having spring properties are fixed in a state where they can be conducted to the conductive portion of the housing 7. Due to the elastic restoring force of the conductive members 64A and 64B, the conductive member 64A is in pressure contact with the transparent electrode 8A, and the conductive member 64B is in pressure contact with the transparent electrode 8B. Thereby, both the transparent electrodes 8A and 8B are connected so as to be equipotential with the conductive portion of the housing 7. That is, in the example shown in FIG. 3B, the conductive connection portion 6aB is constituted by the conductive members 64A and 64B.
[0017]
In FIG.3 (c), the optical filter 4 is hold | maintained by the frame 65 which has electroconductivity, and transparent electrode 8A, 8B and the frame 65 are contacting in the state which can conduct | electrically_connect. The frame body 65 is fastened to the fixing portion 7 a formed on the conductive portion of the housing 7 with screws 66. Thereby, both the transparent electrodes 8A and 8B are connected so as to be equipotential with the conductive portion of the housing 7. That is, in the example shown in FIG. 3C, the conductive connection portion 6aC is configured by the frame body 65, the screw 66, and the fixing portion 7a.
[0018]
With reference to FIG.3 (d), the conductive connection part 6b of the transparent electrode 8C formed in the surface of the sealing glass 5a of the photoelectric conversion element 5 and the conductive part of the housing | casing 7 is demonstrated. A conductive member 64C having a spring property is fixed to the bracket 5b that holds the photoelectric conversion element 5, and the conductive member 64C is in pressure contact with the transparent electrode 8C. One end of the wire 67 is soldered to the conductive member 64 </ b> C, and the other end of the wire 67 is soldered to the conductive portion of the housing 7. About the connection method of the wire 67 and the housing | casing 7, a lug board etc. (not shown) are soldered or crimped | bonded to the wire 67 similarly to the conductive connection part 6aA, and this lug board etc. are screwed to the housing | casing 7. You may stop. As described above, in the example illustrated in FIG. 3D, the conductive connection portion 6 b is configured by the conductive member 64 </ b> C and the wire 67.
[0019]
With the camera configured as described above, when the shooting preparation operation is performed, that is, when the photographer performs operations related to framing, exposure value adjustment, and focus adjustment, the mirror 2 is lowered as shown in FIG. is there. For this reason, the subject image formed by the photographing lens 1 is reflected upward by the mirror 2 and formed on the focusing screen 10. The photographer observes the subject image formed on the focusing screen 10 through a finder optical system (not shown).
[0020]
At the time of shooting, the mirror 2 jumps upward, and after the shutter 3 is opened and closed, the mirror 2 is lowered. Through this series of operations, light from the subject guided by the photographing lens 1 passes through the optical filter 4 and enters the photoelectric conversion element 5.
[0021]
In the above-described camera, the transparent electrodes 8A and 8B formed on both surfaces of the optical filter 4 are formed by the conductive connection portion 6a, and the transparent electrode 8C formed on the surface of the seal glass 5a of the photoelectric conversion element 5 is formed by the conductive connection portion 6b. The conductive portions of the housing 7 are connected to the same potential. Thereby, charging of the optical filter 4 and the photoelectric conversion element 5 is suppressed. Accordingly, it is possible to suppress dust and markings from adhering to the optical filter 4 and the seal glass 5a located near the focal plane of the photographing lens 1.
[0022]
By the way, when the optical filter is charged in the DSC according to the conventional technique and the potential difference generated between the optical filter and the photoelectric conversion element is increased to some extent, discharge may occur. When this discharge occurs, noise may be added to the signal output from the photoelectric conversion element, and depending on the degree of discharge, the photoelectric conversion element itself is destroyed. On the other hand, in the camera according to the present embodiment, the optical filter 4 and the photoelectric conversion element 5 are connected to an equipotential through the conductive portion of the housing 7, so that no potential difference is generated. Does not occur.
[0023]
− Second Embodiment −
In the first embodiment, the transparent electrodes 8A and 8B formed on both surfaces of the optical filter 4 and the transparent electrode 8C formed on the surface of the seal glass 5a are all in conduction with the conductive portion 7 of the housing 7. It was to be connected. On the other hand, in the camera according to the second embodiment, the transparent electrodes 8A to 8C are connected so as to be equipotential with each other, and a voltage source is connected between the transparent electrodes 8A to 8C and the conductive portion of the housing 7. The connection is different. Therefore, the second embodiment will be described focusing on this difference. Other configurations are the same as those shown in FIG.
[0024]
FIG. 4 is an enlarged view of the arrangement of the optical filter 4 and the photoelectric conversion element 5 of the camera, as in FIG. 2 for explaining the first embodiment. In FIG. 4, the same components as those shown in FIG. 2 or FIG. The transparent electrodes 8A and 8B are connected to the terminal 20a of the voltage source 20 by the conductive connection 6aA, while the transparent electrode 8C is connected to the terminal 20a of the voltage source 20 by the conductive connection 6b. The terminal 20 b of the voltage source 20 is connected to the conductive part of the housing 7.
In FIG. 4, the voltage source 20 is illustrated as a DC power source for convenience, and the terminal 20b side is (+). However, the present invention is not limited to this example. That is, the electric potential generated by charging varies depending on the type of crystal constituting the optical filter 4, and it is desirable to change the polarity and voltage of the voltage source 20 to an effective state for suppressing charging according to the type of crystal. .
[0025]
Further, the voltage generated from the voltage source 20 may be not only direct current but also alternating current. In the case of alternating current, the frequency is desirably about several kHz to 20 kHz.
[0026]
According to the above configuration, the electric potential generated from the voltage source 20 can be applied to the transparent electrodes 8A to 8C with the housing 7 as a reference to suppress charging of the optical filter 4 and the photoelectric conversion means 5.
[0027]
− Third embodiment −
A third embodiment will be described with reference to FIG. FIG. 5 is an enlarged view of a portion where the optical filter 4 and the photoelectric conversion element 5 of the camera are disposed, as in FIG. 2 for explaining the first embodiment. In FIG. 5, the same components as those shown in FIG. 2 or FIG. Further, since the configuration other than the portion shown in FIG. 5 is the same as that shown in FIG. 1, the description thereof is omitted.
[0028]
When the movable member such as the blade 3a of the shutter 3 is made of a non-conductive material, static electricity is generated by the operation of the movable member, and the optical filter 4 disposed in the vicinity of the shutter 3 together with the shutter 3 is charged. There is a case. In the third embodiment, charging of the shutter 3 and the optical filter 4 with the operation of the shutter 3 can be suppressed.
[0029]
The base plate 3b of the shutter 3 is formed of a conductive material such as aluminum, brass, or plastic containing carbon fiber. For example, a lug plate (not shown) is connected to one end of the wire 68 and is screwed to the ground plate 3b via the lug plate. Thereby, the ground plane 3b and the wire 68 are electrically connected. The other end of the wire 68 is connected to the terminal 30a of the voltage source 30. The transparent electrodes 8A and 8B are connected to the terminal 30b of the voltage source 30 by the conductive connection 6aA, while the transparent electrode 8C is connected to the terminal 30b of the voltage source 30 by the conductive connection 6b. As in the second embodiment, the polarity of the voltage source 30, DC or AC, the frequency in the case of AC, and the voltage are charged for the shutter 3, the optical filter 4, and the photoelectric conversion element 5. It is set to be in an optimum state for suppression.
[0030]
With the above configuration, it is possible to suppress the generation of static electricity due to the operation of the movable member of the shutter 3.
[0031]
In FIG. 5, none of the shutter 3, the optical filter 4, and the photoelectric conversion element 5 are connected to the conductive portion of the housing 7, but the terminal 30 a or 30 b of the voltage source 30 is connected to the conductive portion of the housing 7. It may be connected to. For example, by connecting the terminal 30 b to the conductive portion of the housing 7, static electricity generated in the optical filter 4 and the photoelectric conversion element 5 can be suppressed without generating a voltage from the voltage source 30.
[0032]
By the way, as described in the related art, in the DSC of the photographic lens exchange type, foreign matter is likely to enter the mirror box 42 (FIG. 1). Therefore, it is desirable to clean the inside of the mirror box 42 periodically. At this time, the foreign matter once adhering to the optical filter 4 or the like may not be easily dropped even when blown using a blower or the like. The camera according to the third embodiment can be easily cleaned as described below.
[0033]
In FIG. 5, a CPU 70 that controls the operation of the camera includes a photographic lens detection unit 71 that detects whether the photographic lens 1 (FIG. 1) is attached, a cleaning mode setting switch 72 for setting a camera cleaning mode, and a release switch. 73, a mirror actuator 74 that moves the mirror 2 (FIG. 1) up and down in conjunction with the photographing operation, and a shutter actuator 75 that drives the shutter 3 are connected. A voltage source 30 is further connected to the CPU 70.
[0034]
The user of the camera removes the taking lens 1 from the camera body 40, operates the cleaning mode setting switch 72 to set the cleaning mode, and turns on the release switch 73. In response to this, the CPU 70 issues a control signal to the mirror actuator 74 and the shutter actuator 75 to raise the mirror 2 (a state indicated by a two-dot chain line in FIG. 1), and to open the shutter 3. Subsequently, the CPU 70 issues a control signal to the voltage source 30 to generate a predetermined voltage from the voltage source 30. At this time, an AC voltage may be generated from the voltage source 30 or a DC voltage may be generated. Thereby, the charging of the shutter 3, the optical filter 4, and the photoelectric conversion element 5 can be neutralized, and thereby, the adsorbing force (attraction generated by static electricity) of the foreign matters adhering to the optical filter 4 and the photoelectric conversion element 5 can be obtained. Can weaken.
[0035]
Moreover, the foreign matter itself adhering to the optical filter 4 or the photoelectric conversion element 5 may be charged. In such a case, an AC voltage is generated from the voltage source 30 or a DC voltage having a polarity that generates a repulsive force against the adhered foreign material is applied to remove the foreign material from the optical filter 4 or the photoelectric conversion element 5. You can also float.
In a state where the voltage as described above is generated from the voltage source 30, the user of the camera can easily remove foreign matters by blowing the inside of the mirror box 42 using a blower or the like. At this time, if a device for charging the air blown from the blower is used and the air charged from the device is blown to generate an attractive force against the above-mentioned foreign material, the foreign material can be more effectively removed.
[0036]
After completing the cleaning as described above, the CPU 70 issues control signals to the voltage source 30, the mirror actuator 74, and the shutter actuator 75 in conjunction with the camera user turning on the release switch 73 again. As a result, no voltage is generated from the voltage source 30, the shutter 3 is closed, and the mirror 2 is lowered.
[0037]
The above-described cleaning mode can also be applied to the second embodiment of the present invention. Further, in the description of the second and third embodiments, the voltage sources 20 and 30 are provided inside the camera. However, the voltage sources 20 and 30 may be omitted and supplied from the outside of the camera. . In this case, in a normal use state, the terminals 20a and 20b or the terminals 30a and 30b are short-circuited. And when setting the above-mentioned cleaning mode, a voltage is applied to these terminals 20a, 20b or 30a, 30b from an external voltage source. By doing so, it is possible to easily achieve a reduction in size and weight and cost of the camera, and to easily remove foreign substances.
[0038]
In the above description of the first to third embodiments, an example in which the present invention is applied to an interchangeable lens type DSC has been described. However, the present invention is also applicable to a photographing lens fixed type DSC. Further, the example in which the optical filter 4 and the photoelectric conversion element 5 are disposed in the vicinity of the primary imaging surface of the photographing lens has been described. However, as will be described below with reference to FIG. 6, a re-imaging optical system is provided. The present invention can also be applied to such DSCs.
[0039]
FIG. 6 is a diagram showing a schematic configuration of a lens interchangeable DSC having a re-imaging optical system composed of a field lens 12 and a relay lens 15, and the same components as those of the lens interchangeable DSC shown in FIG. A description will be given focusing on the difference from that shown in FIG.
[0040]
The following description will be made on the assumption that the photographing state, that is, the state in which the mirror 2 is in the state indicated by the two-dot chain line in FIG. 6 and the shutter 3 is open. A field lens 12 is disposed in the vicinity of the primary imaging plane of the taking lens 1. Mirrors 13 and 14 for bending the optical path are disposed behind the field lens 12, and a relay lens 15 is disposed behind the mirror 14. The subject image formed on the primary imaging surface of the photographic lens 1 is reduced on the light receiving surface of the photoelectric conversion element 5 through the field lens 12, the mirror 13, the mirror 14, the relay lens 15, and the optical filter 4. Form an image. That is, the light receiving surface of the photoelectric conversion element 5 becomes the secondary imaging surface of the photographic lens 1. On the optical path p indicated by the one-dot chain line in FIG. 6, reflection occurs even if foreign matter such as dust or fluff is present in the vicinity of either the primary imaging surface or the secondary imaging surface. . In such a case, it is desirable to provide a transparent electrode on the surface of the field lens 12 or the emission surface side of the relay lens 15 and connect it to the conductive portion of the housing 7 or to the voltage source 20 or 30.
[0041]
-Fourth embodiment-
Although an example in which the present invention is applied to a camera has been described above, the present invention can also be applied to other optical devices. In the fourth embodiment, an example in which the present invention is applied to an image input apparatus will be described.
[0042]
Referring to FIG. 7 showing a schematic configuration of the image input apparatus, the image input unit 200 includes a mirror 112, an imaging lens 114, a photoelectric conversion element 202, a housing 208 for housing these, and the like. In the photoelectric conversion element 202, pixels are arranged one-dimensionally along a direction perpendicular to the paper surface of FIG. A toothed belt (timing belt) 108 is stretched between pulleys 104 and 106. The image input unit 200 is fixed to the toothed belt 108. The pulley 104 is rotationally driven by the stepping motor 102, whereby the image input unit 200 is reciprocated in the left-right direction in FIG. These components are housed in the housing 122. A platen glass 116 is disposed in an opening formed above the housing 122, and a document presser 118 capable of covering the entire platen glass 116 is disposed.
[0043]
A host computer (not shown) is connected to the image input apparatus 100 configured as described above. In response to the operator setting the read original M on the platen glass 116 and operating the host computer, an image input command is issued from the host computer to the image input apparatus 100. Based on this image input command, the image input apparatus 100 starts image input of the document M and transfers the image data to the host computer. That is, after the image of the document M formed by the imaging lens 114 is linearly read by the photoelectric conversion element 202, the operation of moving the image input unit 200 in the horizontal direction in FIG. The two-dimensional image is input.
[0044]
At this time, if foreign matter adheres to the front surface (original placement surface) or back surface of the platen glass 116, or the exit surface of the imaging lens 114 or the light receiving surface of the photoelectric conversion element 202, the shadow of the foreign matter is reflected. End up. In particular, when a foreign object adheres to the light exit surface of the imaging lens 114 or the light receiving surface of the photoelectric conversion element 202, a specific pixel of the photoelectric conversion element 202 is always irritated, so that a line is reflected in the input image, which is difficult to see. There is.
[0045]
Therefore, in the image input device shown in FIG. 7, a transparent electrode (not shown) is formed on the back surface side of the platen glass 116, and this transparent electrode is connected to the conductive portion of the housing 122 by the conductive connection portion 120. Similarly, the transparent electrode (not shown) formed on the exit surface of the imaging lens 114 is electrically connected by the conductive connection portion 206, and the transparent electrode (not shown) formed on the surface of the seal glass 202a of the photoelectric conversion element 202 is electrically connected. The portions 204 are connected to the conductive portions of the housing 208, respectively. For example, those shown in FIG. 3B or FIG. 3C can be used as the conductive connection portions 120, 206, and 204.
[0046]
The conductive portion of the housing 208 and the conductive portion of the housing 122 are connected by a conductive member 210 that can be expanded and contracted like a flexible printed circuit board (FPC). Therefore, even when the reading unit 200 moves in the left-right direction in FIG. 7, the conductive state of the housing 208 and the conductive portion of the housing 122 can be maintained. With the configuration described above, the platen glass 116, the exit surface of the imaging lens 114, and the photoelectric conversion element 202 are all connected to the same potential as that of the housing 122, and generation of static electricity can be suppressed. Accordingly, it is possible to suppress the foreign matter from adhering to the platen glass 116, the imaging lens 114, or the photoelectric conversion element 202 to cause reflection.
[0047]
The optical apparatus to which the present invention is applied is not limited to the examples described above. For example, an image input device that does not have an imaging lens and reads the photoelectric conversion element in close contact with the read original, or an image in which a fiberscope-shaped light guide is interposed between the read original and the photoelectric conversion element It can also be applied to an input device.
[0048]
  In the correspondence between the embodiments of the present invention and the claims, the photoelectric conversion elements 5 and 202 have photoelectric conversion means.,Conductive connection6aA andConductive member 210 is conductiveElementThe imaging lens 1 constitutes an imaging lens, and the optical filter 4, the field lens 12, the mirror 13, the mirror 14 and the relay lens 15 constitute optical members.
[0049]
【The invention's effect】
  As explained above,BookAccording to the invention, charges generated in the optical member disposed in the optical path between the imaging lens and the photoelectric conversion means can be neutralized, so that foreign matters such as dust and debris adhere to the surface of the optical member. And can suppress the appearance of reflections.
[Brief description of the drawings]
FIG. 1 is a diagram showing a first embodiment of the present invention, and is a diagram showing an example when an optical apparatus according to the present invention is a camera.
FIG. 2 is an enlarged view of the vicinity of an optical filter and a photoelectric conversion element arrangement portion of the camera.
FIG. 3 is a diagram similarly showing details of the conductive connection portion, in which (a) to (c) show examples of the connection portion between the optical filter and the housing, and (d) shows the photoelectric conversion element and the housing. The example of the connection part is shown.
FIG. 4 is a diagram showing a second embodiment of the present invention, and is a diagram showing a main part of another example when the optical apparatus according to the present invention is a camera.
FIG. 5 is a diagram showing a third embodiment of the present invention, and is a diagram showing a main part of still another example when the optical apparatus according to the present invention is a camera.
FIG. 6 is a diagram illustrating an example in which the present invention is applied to a camera having a re-imaging optical system.
FIG. 7 is a diagram showing a fourth embodiment of the present invention, and is a diagram showing an example in which an optical apparatus according to the present invention is an image input device.
[Explanation of symbols]
1 Photo lens
2 Mirror
3 Shutter
4 Optical filters
5, 202 Photoelectric conversion element
5a, 202a Seal glass
6a, 6aA, 6aB, 6aC, 6b, 120, 204, 206, 210 Conductive connection
7, 122 housing
8A, 8B, 8C Transparent electrode
12 Field lens
15 Relay lens
20, 30 Voltage source

Claims (6)

Photoelectric conversion means for converting an optical image formed by the imaging lens into an electrical signal;
Sealing glass formed on the incident surface of the photoelectric conversion means;
An optical member disposed in the optical path between the imaging lens and the sealing glass, with a space provided between the sealing glass, and
Transparent electrodes provided on the entrance surface and the exit surface of the optical member located at least in the vicinity of the image formation surface of the image formation lens;
A conductive member that is electrically connected to the transparent electrode and neutralizes charges generated in the optical member by charging; and
An optical apparatus comprising: The optical instrument according to claim 1 ,
An optical apparatus, further comprising: a voltage source that applies a voltage to the conductive member so as to reduce an adsorbing force of an adhering matter adhering to the optical member. The optical instrument according to claim 1 ,
A shutter that can be switched to a light-blocking state that blocks a light beam incident on the photoelectric conversion means or an open state that allows the light beam to pass through is disposed on the incident surface side of the optical member,
An optical apparatus, wherein the optical device is disposed close to a position where the optical member is charged with the operation of the shutter with respect to a positional relationship between the shutter and the optical member. The optical apparatus according to claim 3 .
An optical apparatus, further comprising: a voltage source that applies a voltage to the conductive member so as to reduce an adsorbing force of an adhering matter adhering to the optical member. The optical apparatus according to claim 4 ,
An optical apparatus further comprising an operation mode for maintaining the shutter in an open state and applying the voltage to the optical member. The optical apparatus according to claim 5 , wherein
The optical apparatus, wherein the voltage source is controlled to apply a voltage to the conductive member in accordance with a manual operation by a user.

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