JP2000029132A - Optical equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress the sticking of dust and fluff caused by the electrification of an optical member and a photoelectric converter disposed in the midst of the optical path of an optical equipment. SOLUTION: Light emitted from an image formation lens is transmitted through an optical filter 4 and is made incident on the photoelectric converter 5. Transparent electrodes 8A and 8B are formed on the surface of the optical filter 4, and the transparent electrode 8C is formed on the surface of a seal glass 5a covering the photodetector of the photoelectric converter 5. The transparent electrodes 8A-8C are connected to the conductive part of the housing 7 of the optical equipment through conductive connecting parts 6a and 6b so that potential is equal. Thus, the sticking of the dust and the fluff because static electricity is generated at the optical filter 4 and the photoelectric converter 5 is suppressed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical device, and more particularly, to an optical device such as an image input device or an electronic camera for converting an optical image into an electric signal, and dust or the like on a surface of a photoelectric conversion element such as a CCD. The present invention relates to an optical device capable of preventing reflection of an image to be attached and input.

[0002]

2. Description of the Related Art A single lens reflex digital still camera capable of exchanging a photographing lens (hereinafter, a single lens reflex digital still camera capable of exchanging a photographing lens is referred to as a "lens interchangeable DSC". , A digital still camera is referred to as “DSC”). In the interchangeable lens type DSC, foreign matters such as dust and fluff easily enter the mirror box when the taking lens is removed.

Further, since a mechanism for controlling a mirror and an aperture of a photographing lens is operated in the mirror box, dust may be generated inside the mirror box.

[0004] These foreign matters are located near the focal plane of the taking lens,
In other words, if it adheres to 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, the appearance of the shadow of the foreign matter in the input image is simply referred to as “the occurrence of reflection”.

[0005] The same applies to image input devices such as facsimile machines and scanners. When a document is sent or when the document reading unit moves, foreign matter such as dust or fluff is generated. When it adheres to glass for use (platen glass) or the like, reflection may occur as in the case of the lens interchangeable DSC.

[0006]

In order to eliminate such inconveniences, it is a general practice to use a blower or the like to blow off foreign substances adhering to the photoelectric conversion element surface or the like to clean such a lens. However, the blown foreign matter does not come out of the camera and may adhere to the inside of the mirror box. The same applies to optical devices such as facsimile machines and scanners. In some cases, blown foreign substances do not come out of the optical device but stay inside the device.

Incidentally, an optical filter for controlling the spatial frequency characteristic is provided in the DSC in the vicinity of the photoelectric conversion element. For this optical filter, a crystal such as a quartz plate having birefringence characteristics is used. Since these crystals have a piezoelectric effect, the crystals themselves are easily charged by vibration or the like, and have a property that the charged charges are hard to escape.
Further, since an insulating insulating material such as plastic or ceramic is used as a material of a package of the photoelectric conversion element, there is a background that when the photoelectric conversion element is charged, it is difficult for the charge to escape.

[0008] The above-mentioned foreign substances may float in the equipment due to vibration or air flow generated by the operation of the equipment, and may adhere again to the charged optical filter or photoelectric conversion element as described above. Was. As a result, reflection occurs again, and it is necessary to frequently clean the optical device.

According to the present invention, the charge generated when the above-mentioned optical filter and photoelectric conversion element are charged is neutralized, and foreign matter adheres to the optical filter and photoelectric conversion element to cause reflection. The purpose is to suppress the

[0010]

FIG. 1 shows an embodiment of the present invention.
The following invention will be described with reference to FIG. (1) The invention according to claim 1 is a photoelectric conversion unit that converts an optical image guided to a light receiving unit into an electric signal, wherein the photoelectric conversion unit 5 includes a cover member 5a that covers the light receiving unit; The above-mentioned object is achieved by having a transparent electrode 8C formed on the surface of the substrate and a conductive means 6B electrically connected to the transparent electrode 8C and for neutralizing the charge generated in the photoelectric conversion means 5 by charging. . (2) The invention according to claim 2 is a photoelectric conversion means 5 for converting an optical image formed by the imaging lens 1 into an electric signal.
An optical member 4 disposed in the optical path between the imaging lens 1 and the photoelectric conversion means 5; and a transparent electrode provided on the surface of the optical member 4 located at least near the imaging surface of the imaging lens 1. 8B; and a conductive member 6a that is electrically connected to the transparent electrode 8B and neutralizes electric charges generated in the optical member 4 by charging. (3) In connection with FIG. 4 showing one embodiment, the invention according to claim 3 is a method in which conductive means is provided so as to reduce the adsorbing force of a substance attached to the photoelectric conversion means 5 or the optical member 4. It further includes a voltage source 20 for applying a voltage to 6aA or 6b. The following invention will be described in association with FIG. 5 showing one embodiment. (4) The invention according to claim 4 further includes a shutter 3 that can be switched to a light-blocking state for blocking a light beam incident on the photoelectric conversion means 5 or an open state for allowing the light beam to pass therethrough;
Regarding the positional relationship between the shutter 3 and the optical member 4, the shutter 3 is disposed close to a position where the optical member 4 is charged with the operation of the shutter 3. (5) According to the fifth aspect of the present invention, the conductive members 68 and 6aA are so formed as to reduce the adsorbing power of the adhering substances adhered to the optical member 4.
And a voltage source 30 for applying a voltage to the power supply. (6) The invention according to claim 6 further includes an operation mode in which the shutter 3 is maintained in the open state and a voltage is applied to the optical member 4.

In the section of the means for solving the above-mentioned problems, which explains the configuration of the present invention, the drawings of the embodiments of the present invention are used to make the present invention easier to understand. However, the present invention is not limited to this.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First Embodiment FIG. 1 shows a lens-interchangeable DSC to which the present invention is applied (hereinafter, the lens-interchangeable DSC is simply referred to as “camera” in the present specification). It is a figure which shows a principal part schematically. A photographing lens 1 that can be exchanged according to a photographing purpose is mounted on the camera body 40. Inside the mirror box 42 of the camera body 40, the mirror 2, the shutter 3, the optical filter 4, the photoelectric conversion element 5, and the like are arranged. The focusing screen 10 is disposed above the mirror box 42.

The mirror 2 is automatically switched between a down state, ie, a state shown by a solid line in FIG. 1, and an up state, ie, a state shown by a two-dot chain line in FIG. 1, according to the operation state of the camera. The shutter 3 controls the amount of light incident on the light receiving surface of the photoelectric conversion element 5 disposed behind the shutter 3 together with the optical filter 4. The optical filter 4 is configured by superposing an optical low-pass filter formed of a crystal such as quartz having birefringent characteristics, a filter for cutting light in an infrared wavelength range, a quarter-wave plate, and the like.

The description of the first embodiment will be continued with reference to FIG. 2 showing an enlarged view of the arrangement of the optical filter 4 and the photoelectric conversion element 5 of the camera shown in FIG. A transparent electrode 8A such as a Nesa film is provided on the entrance surface and the exit surface of the optical filter 4.
And 8B are each formed. A sealing 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 formed on the surface of the sealing glass 5a. These transparent electrodes 8A to 8C are connected to the conductive portion of the housing 7 by the conductive connection portions 6a or 6b as described later.

Referring to FIG. 3, which is a partially enlarged view of the optical filter 4 and the housing 7, a conductive connecting portion 6a between the housing 7 and the transparent electrodes 8A and 8B formed on the surface of the optical filter 4. Will be described. In FIG. 3A, a through hole 4 a is formed in the optical filter 4. A conductive pin 61 is inserted into the through hole 4a, and the pin 61 and the transparent electrodes 8A and 8B are bonded with a conductive adhesive 60 such as a silver paste. Thereby, the pins 61 and the transparent electrodes 8A, 8A
B becomes conductive. One end of a wire 62 is soldered to the pin 61, and the other end is soldered to a conductive portion of the housing 7. When connecting the wire 62 to the conductive portion of the housing 7, a lug plate or the like (not shown) is soldered or crimped to the wire 62, and the lug plate or the like is screwed to the housing 7. There may be. Thereby, the transparent electrode 8
A and 8B are connected to be equal in potential to the conductive portion of the housing 7. As described above, in the example shown in FIG. 3A, the conductive connection portion 6aA includes the conductive adhesive 60, the pins 61, and the wires 62.

The conductive connection between the transparent electrodes 8A and 8B and the conductive portion of the housing 7 is shown in FIG.
The following may be used. This will be described below. In FIG. 3B, conductive members 64 </ b> A and 64 </ b> B having a spring property are fixed to the conductive portion of the housing 7 in a conductive state. Due to the elastic restoring force of these conductive members 64A and 64B, the conductive member 64A is pressed against the transparent electrode 8A, and the conductive member 64B is pressed against the transparent electrode 8B. As a result, the transparent electrodes 8A and 8B are both connected to the conductive portion of the housing 7 so as to have the same potential. That is, in the example shown in FIG. 3B, the conductive connecting portion 6aB is formed by the conductive members 64A and 64B.

In FIG. 3C, the optical filter 4 is held by a conductive frame 65, and the transparent electrode 8A,
8B and the frame 65 are in contact with each other in a conductive state. The frame 65 is fastened to the fixing portion 7 a formed on the conductive portion of the housing 7 with a screw 66. Thereby, the transparent electrodes 8A, 8
B is connected to the conductive portion of the housing 7 so as to have the same potential. That is, in the example shown in FIG. 3C, the conductive connecting portion 6aC is configured by the frame 65, the screw 66, and the fixing portion 7a.

With reference to FIG. 3D, a description will be given of the conductive connection portion 6b between the transparent electrode 8C formed on the surface of the seal glass 5a of the photoelectric conversion element 5 and the conductive portion of the housing 7. A conductive member 64C having a spring property is fixed to the bracket 5b holding the photoelectric conversion element 5, and the conductive member 64C is pressed against the transparent electrode 8C. The wire 67 is connected to the conductive member 64C.
Is soldered, and the other end of the wire 67 is soldered to the conductive portion of the housing 7. Regarding the connection method between the wire 67 and the housing 7, a lug plate or the like (not shown) is soldered or crimped to the wire 67 in the same manner as the conductive connection portion 6 aA. It may stop. As described above, in the example shown in FIG. 3D, the conductive connection portion 6b is configured by the conductive member 64C and the wire 67.

At the time of the photographing preparation operation of the camera configured as described above, that is, when the photographer performs operations related to framing, exposure value adjustment, focus adjustment, and the like,
The mirror 2 is in a lowered state as shown in FIG. Therefore, the subject image formed by the photographing lens 1 is reflected upward by the mirror 2 and forms an image on the focusing screen 10. The photographer observes the subject image formed on the focusing screen 10 via a finder optical system (not shown).

During photographing, the mirror 2 jumps upward, and after the shutter 3 opens and closes, the mirror 2 lowers.
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.

In the above-described camera, the transparent electrodes 8A and 8B formed on both surfaces of the optical filter 4 are connected to the conductive connecting portions 6a.
Thus, the transparent electrode 8C formed on the surface of the seal glass 5a of the photoelectric conversion element 5 is connected to the conductive portion of the housing 7 at the same potential by the conductive connecting portion 6b. Thereby, charging of the optical filter 4 and the photoelectric conversion element 5 is suppressed. Therefore, it is possible to suppress adhesion of dust and fluff to the optical filter 4 and the seal glass 5a located near the focal plane of the photographing lens 1.

By the way, the optical filter is charged by the DSC according to the conventional technique, and a discharge may occur when the potential difference between the optical filter and the photoelectric conversion element becomes large to some extent. When this discharge occurs, noise may be added to a signal output from the photoelectric conversion element, and depending on the degree of the discharge, the photoelectric conversion element itself may be damaged. On the other hand, in the camera according to the present embodiment, since the optical filter 4 and the photoelectric conversion element 5 are connected to the same potential through the conductive portion of the housing 7, no potential difference is generated, and therefore, the above-described inconvenience occurs. Does not occur.

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 sealing glass 5a are all provided. It was connected to the conductive portion 7 of the housing 7 in a conductive state. On the other hand, in the camera according to the second embodiment, the transparent electrodes 8A to 8A
8C are connected to each other so that they have the same potential, and a voltage source is connected between the transparent electrodes 8A to 8C and the conductive portion of the housing 7. Therefore, focusing on this difference, the second
An embodiment will be described. Other configurations are the same as those shown in FIG.

FIG. 4 is an enlarged view of a portion where the optical filter 4 and the photoelectric conversion element 5 of the camera are provided, similarly to FIG. 2 for describing the first embodiment. In FIG. 4, FIG.
Alternatively, the same components as those shown in FIG. 3 are denoted by the same reference numerals, and description thereof will be omitted. Transparent electrodes 8A, 8B
Is 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 portion 6b. Voltage source 20
Terminal 20b is connected to the conductive portion of the housing 7. In addition,
In FIG. 4, the voltage source 20 is shown as a DC power supply for convenience, and the terminal 20b side is (+). However, the present invention is not limited to this example. That is, the 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 a state effective for suppressing charging according to the type of crystal. .

The voltage generated from the voltage source 20 may be not only DC but also AC. In the case of alternating current, the frequency is desirably about several kHz to 20 kHz.

According to the above configuration, the electric potential generated from the voltage source 20 is applied to the transparent electrodes 8A to 8A with respect to the housing 7.
8C, the charging of the optical filter 4 and the photoelectric conversion means 5 can be suppressed.

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 provided, similarly to FIG. 2 for describing the first embodiment. In FIG. 5, the same components as those shown in FIG. 2 or 3 are denoted by the same reference numerals, and description thereof will be omitted. The configuration other than that shown in FIG. 5 is the same as that shown in FIG.

When the movable member such as the blade 3a of the shutter 3 is made of a non-conductive material, the operation of the movable member generates static electricity, and the optical filter 4 disposed near the shutter 3 together with the shutter 3. May be charged. In the third embodiment, it is possible to suppress charging of the shutter 3 and the optical filter 4 with the operation of the shutter 3.

The base plate 3b of the shutter 3 is made of aluminum, brass,
Alternatively, it is formed of a conductive material such as carbon fiber-containing plastic. 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 plate 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 portion 6aA, while
C is connected to terminal 30b of voltage source 30 by conductive connection 6b. As in the second embodiment, the polarity of the voltage source 30, whether the voltage is direct current or alternating current, the frequency in the case of alternating current, and the voltage, and the voltage are determined by charging the shutter 3, the optical filter 4, and the photoelectric conversion element 5. It is set to be in an optimal state for suppression.

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.

In FIG. 5, the shutter 3, the optical filter 4, and the photoelectric conversion element 5 are not connected to the conductive portion of the housing 7, but are connected to the terminal 30 of the voltage source 30.
a or 30 b may be connected to the conductive portion of the housing 7. For example, by connecting the terminal 30b 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.

By the way, as described in the prior art, in the DSC of the interchangeable taking lens type, foreign matter easily enters the inside of the mirror box 42 (FIG. 1). Therefore, it is desirable to periodically clean the inside of the mirror box 42.
At this time, the foreign matter that has once adhered to the optical filter 4 or the like may not be easily removed even if it is blown using a blower or the like. The camera according to the third embodiment can easily perform cleaning as described below.

In FIG. 5, C for controlling the operation of the camera
The PU 70 has a photographic lens detecting unit 71 for detecting whether or not the photographic lens 1 (FIG. 1) is attached, a cleaning mode setting switch 72 for setting a camera cleaning mode, a release switch 73, and a mirror in conjunction with the photographing operation. A mirror actuator 74 for moving the shutter 2 (FIG. 1) up and down and a shutter actuator 75 for driving the shutter 3 are connected. The voltage source 30 is further connected to the CPU 70.

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 (the state shown by the two-dot chain line in FIG. 1), and to open the shutter 3. CPU 70
Sends a control signal to the voltage source 30 to cause the voltage source 30 to generate a predetermined voltage. At this time, the voltage source 30 may generate an AC voltage or a DC voltage. Thereby, the charging of the shutter 3, the optical filter 4, and the photoelectric conversion element 5 can be neutralized, and thereby, the attraction force (attraction force generated by static electricity) of the foreign matter adhering to the optical filter 4 and the photoelectric conversion element 5 is reduced. Can be weakened.

Further, the foreign substance adhering to the optical filter 4, the photoelectric conversion element 5, etc. may be charged.
In such a case, the foreign matter is removed from the optical filter 4 or the photoelectric conversion element 5 by generating an AC voltage from the voltage source 30 or applying a DC voltage having a polarity that causes repulsion to the attached foreign matter. You can float it. When the user of the camera blows the inside of the mirror box 42 using a blower or the like with the above-described voltage generated from the voltage source 30, foreign substances can be easily removed. At this time, if a device for charging air blown out from the blower is used, and the charged air is blown out from this device to generate an attractive force for the above-described foreign matter, the foreign matter can be more effectively removed.

After the cleaning is completed 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 closes, and the mirror 2 goes down.

The above-described cleaning mode can 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 3
Although 0 is provided inside the camera, these voltage sources 20 and 30 may be omitted and supplied from outside the camera. In this case, the terminals 20a and 20b or the terminals 30a and 30b are short-circuited in a normal use state. When setting the above-mentioned cleaning mode, these terminals 20a, 20b or 30a, 30b
Voltage from an external voltage source. By doing so, it is possible to easily reduce the size and weight of the camera and reduce the cost, and it is also possible to easily remove foreign matter.

In the above description of the first to third embodiments, an example in which the present invention is applied to a DSC of an interchangeable lens type has been described. However, the present invention is also applicable to a DSC of a fixed photographing lens type. is there. Also, an example has been described in which the optical filter 4 and the photoelectric conversion element 5 are provided in the vicinity of the primary imaging plane of the taking lens. However, as described below with reference to FIG. The present invention can be applied to such a DSC.

FIG. 6 is a diagram showing a schematic configuration of a lens interchangeable DSC having a re-imaging optical system including a field lens 12 and a relay lens 15, and the same components as those of the lens interchangeable DSC shown in FIG. Are denoted by the same reference numerals, and a description will be given focusing on differences from those shown in FIG.

The following description will be made on the assumption that the photographing state is set, that is, the mirror 2 is in the state shown by the two-dot chain line in FIG. 6 and the shutter 3 is open. A field lens 12 is provided near the primary imaging plane of the taking lens 1.
Mirrors 13 and 14 for bending the optical path are provided behind the field lens 12, and a relay lens 15 is provided behind the mirror 14. The subject image formed on the primary image forming surface of the photographing 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 and re-reduced. Form an image. That is, the light receiving surface of the photoelectric conversion element 5 is
Is the secondary image plane. An optical path p indicated by a dashed line in FIG.
Above, even if foreign matter such as dust or fluff is present in the vicinity of any one of the primary image forming surface and the secondary image forming surface, reflection occurs. In such a case, a transparent electrode is provided on the surface of the field lens 12 or on the emission surface side of the relay lens 15 and is connected to the conductive portion of the housing 7 or a voltage source 20 is provided.
Or it is desirable to connect to 30.

Fourth Embodiment In the above, an example in which the present invention is applied to a camera has been described. However, the present invention can be applied to other optical apparatuses. In the fourth embodiment, an example in which the present invention is applied to an image input device will be described.

Referring to FIG. 7, which shows a schematic configuration of the image input device, the image input unit 200 includes a mirror 1
12, an imaging lens 114, a photoelectric conversion element 202, and a housing 208 for accommodating them. The photoelectric conversion element 202 has pixels 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 driven to rotate by a stepping motor 102, whereby the image input unit 200 is driven to reciprocate in the left-right direction on the page of FIG. These components are housed in the housing 122.
A platen glass 116 is provided in an opening formed above the housing 122, and the platen glass 116
A document holder 118 capable of covering the whole is provided.

The image input device 10 configured as described above
0 is connected to a host computer (not shown). An image input command is issued from the host computer to the image input device 100 in response to the operator setting the read original M on the platen glass 116 and operating the host computer. Based on the image input command, the image input apparatus 100 starts inputting an image of the document M, and transfers image data to the host computer. That is, the imaging lens 114
Is read linearly by the photoelectric conversion element 202 by the photoelectric conversion element 202, and the operation of moving the image input unit 200 in the horizontal direction of FIG. Enter

At this time, if foreign matter is attached to the front surface (original mounting surface) or back surface of the platen glass 116, or the emission surface of the imaging lens 114 or the light receiving surface of the photoelectric conversion element 202, the shadow of the foreign matter will It is reflected. In particular, if a foreign substance adheres to the emission 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 will always be shaded, so that a line appears in the input image and becomes unsightly. There is.

Therefore, in the image input device shown in FIG. 7, a transparent electrode (not shown) is formed on the back side of the platen glass 116, and this transparent electrode is
22 are connected. Similarly, the imaging lens 11
The transparent electrode (not shown) formed on the light exit surface of the photoelectric conversion element 202 of the photoelectric conversion element 202 is connected to the conductive connection portion 206.
A transparent electrode (not shown) formed on the surface of the second electrode 02 a is connected to a conductive portion of the housing 208 by a conductive connection portion 204. For example, those shown in FIG. 3B or FIG. 3C can be used as these conductive connection portions 120, 206, and 204.

The conductive portion of the housing 208 and the housing 122
Are connected to each other by a conductive member 210 which can be stretched and contracted like a flexible printed circuit board (FPC). Therefore, the reading unit 200 is
Of the housing 208 and the conductive part of the housing 122 can be maintained even when the conductive part moves in the left-right direction of the drawing. With the above-described configuration, 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 the housing 122, so that generation of static electricity can be suppressed. Therefore, it is possible to suppress the occurrence of reflection due to the attachment of foreign matter to the platen glass 116, the imaging lens 114, or the photoelectric conversion element 202.

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 almost in close contact with the document to be read, or an image in which a fiberscope-shaped light guide is interposed between the read document and the photoelectric conversion element It can also be applied to an input device.

In the correspondence between the above-described embodiment and the claims, the photoelectric conversion elements 5 and 202 correspond to the photoelectric conversion means, the seal glasses 5a and 202a correspond to the cover member, and
The conductive connecting portions 6aA, 6b, 120, 204, and 206 and the conductive member 210 are conductive members, the taking lens 1 is an imaging lens, and the optical filter 4, the field lens 12, the mirror 13, the mirror 14, and the relay lens 15 are optical members. Respectively.

[0049]

As described above, (1) According to the first aspect of the present invention, the charge generated in the photoelectric conversion means can be neutralized, so that the cover covering the light receiving portion of the photoelectric conversion means is provided. It is possible to prevent foreign matters such as dust and fluff from adhering to the member and to cause reflection. (2) According to the second aspect of the present invention, it is possible to neutralize the electric charge generated in the optical member disposed in the optical path between the imaging lens and the photoelectric conversion means, so that the surface of the optical member can be neutralized. It is possible to prevent a foreign substance such as dust and fluff from adhering to the surface and to cause reflection. (3) According to the third aspect of the present invention, by applying a voltage to the conductive means so as to reduce the adsorbing force of the adhered matter adhering to the photoelectric conversion means or the optical member, the adhered matter is suppressed from adhering. And the removal of the deposits attached to the photoelectric conversion means or the optical member is facilitated. (4) According to the fourth aspect of the invention, it is possible to prevent the optical member from being charged due to the operation of the shutter and to adhere foreign matter. (5) According to the invention described in claim 5, it is possible to prevent the optical member from being charged due to the operation of the shutter and to prevent the adhered substance from adhering, and the adhered substance adheres to the optical member or the photoelectric conversion means. In this case, it is easy to remove the deposit. (6) According to the invention described in claim 6, since the shutter is maintained in the open state and the operation mode for applying a voltage to the optical member is provided, it is possible to remove the adhered matter adhered to the optical member and the photoelectric conversion unit. It will be easier.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating a first embodiment of the present invention, and is a diagram illustrating an example in which an optical device 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 provided portion of the camera.

FIG. 3 is a view showing details of a conductive connection portion,
(A) to (c) show an example of a connection portion between the optical filter and the housing, and (d) shows an example of a connection portion between the photoelectric conversion element and the housing.

FIG. 4 is a diagram illustrating a second embodiment of the present invention, and is a diagram illustrating a main part of another example in a case where the optical apparatus according to the present invention is a camera.

FIG. 5 is a view illustrating a third embodiment of the present invention, and is a view illustrating a main part of still another example in a case where 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 illustrating a fourth embodiment of the present invention, and is a diagram illustrating an example in which an optical device according to the present invention is used as an image input device.

[Explanation of symbols]

Reference Signs List 1 shooting lens 2 mirror 3 shutter 4 optical filter 5, 202 photoelectric conversion element 5a, 202a sealing glass 6a, 6aA, 6aB, 6aC, 6b, 120, 20
4, 206, 210 Conductive connection part 7, 122 Case 8A, 8B, 8C Transparent electrode 12 Field lens 15 Relay lens 20, 30 Voltage source

Claims (6)

[Claims] 1. A photoelectric conversion unit for converting an optical image guided to a light receiving unit into an electric signal, wherein the photoelectric conversion unit has a cover member covering the light receiving unit, and a transparent electrode formed on a surface of the cover member. An optical device, comprising: a conductive unit electrically connected to the transparent electrode to neutralize a charge generated in the photoelectric conversion unit by charging. A photoelectric conversion means for converting an optical image formed by the imaging lens into an electric signal; an optical member disposed in an optical path between the imaging lens and the photoelectric conversion means; A transparent electrode provided on a surface of the optical member located at least in the vicinity of the imaging surface of the imaging lens; and a conductive member electrically connected to the transparent electrode and for neutralizing a charge generated in the optical member by charging. An optical device comprising: 3. The optical device according to claim 1, further comprising a voltage source for applying a voltage to said conductive means so as to reduce an adsorbing force of a substance adhering to said photoelectric conversion means or said optical member. An optical device characterized by that: 4. The optical apparatus according to claim 2, wherein a light blocking state for blocking a light beam incident on said photoelectric conversion means,
Alternatively, the shutter further includes a shutter that can be switched to an open state that allows the light beam to pass therethrough, and the positional relationship between the shutter and the optical member is close to a position where the optical member is charged with the operation of the shutter. An optical device characterized by being disposed as a unit. 5. The optical device according to claim 4, further comprising: a voltage source for applying a voltage to said conductive member so as to reduce an adsorbing force of an adhering substance attached to said optical member. . 6. The optical apparatus according to claim 5, further comprising an operation mode for maintaining the shutter in an open state and applying the voltage to the optical member.