JPH0634366U - Image input device - Google Patents

Abstract

(57) [Abstract] [Purpose] To reliably block harmful light rays entering the image input device and to hold optical components stably. [Structure] The CCD 9 and the projection optical system 11 are connected to the harmful ray 1.
Light-shielding plate 12 composed of an elastic member that shields the light-shielding members 5 and 16 from each other
Is fixed to the chassis 6, and the CCD 9 and the projection optical system 11 are held by the light shielding plate 12 and elastically pressed against the chassis 6 to absorb vibrations from the outside.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image input device, and more particularly to an image input device including a light blocking plate that blocks harmful rays.

[0002]

[Prior art]

 An image input device such as a 35 mm film scanner is conventionally configured as shown in FIGS. 6 and 7. In FIG. 6, the main body of the apparatus is composed of a light emitting unit 102 in which a light source (not shown) is housed and a light receiving unit 101 in which a CCD (not shown) and a CCD as an image sensor are housed. Further, a document holding unit 103 is provided between the light emitting unit 102 and the light receiving unit 101, and the document 104 is attached and detached from above. Further, an inverted U-shaped light shielding plate 105 is provided on the main body of the apparatus so as to be movable in the optical axis direction, so that the document holder 103 can be opened and closed. Then, as shown in FIG. 6, the original 104 is attached / detached with the light shielding plate 105 open, and the image information of the original image is read with the light shielding plate 105 closed as shown in FIG. Be done.

According to the above configuration, as shown in FIG. 6, when the light shielding plate 105 is opened, the harmful light beam 106 may directly enter the original 104, and image information may be deteriorated. As shown, when the light shielding plate 105 is closed, the harmful rays 106 can be prevented from entering.

As another conventional image input device, there is also one shown in FIGS. 8 and 9. 8 and 9, the document holding section 111 is horizontally supported via an arm 112, and the arm 112 is movable by being guided by a guide rail 114 horizontally provided on the frame 113. Has become. The arm 112 is horizontally moved by a feed screw 116 that is rotationally driven by a motor 115. Furthermore, a light source 117 is arranged above the document holder 111, and a 45-degree reflecting mirror 119 is provided on the substrate 118 directly below the light source 117. Further, a projection lens 120 is provided on the substrate 118, and light emitted from the light source 117 illuminates an original document (not shown) on the original document holding section 111 so that the projection lens 120 forms an image on the CCD 121. It has become.

On the other hand, the light blocking plate 122 having a substantially U-shaped cross section is arranged between the document holding portion 111 and the substrate 118, and both ends thereof are fixed to the substrate 118. Further, the light shielding plate 122 is formed with a slit 122a on the optical axis connecting the light source 117 and the reflection mirror 119. According to the above configuration, the light ray 123 of the image information is incident on the projection optical system through the slit 122a, but the light ray 124 from the light source other than the image information and the harmful light rays such as the disturbance light ray 125 are blocked by the light shielding plate 122. Therefore, it does not enter the CCD 121.

[0006]

[Problems to be solved by the device]

 However, in the conventional image input device shown in FIG. 6 and FIG. 7, the harmful light beam 106 enters the projection optical system without forgetting to close the light shielding plate 105, which deteriorates the image information. Further, in each of the conventional image input devices shown in FIGS. 6 to 9, since the light shielding plates 105 and 122 as independent components are required, there is a problem that component cost and assembly cost increase.

On the other hand, the projection optical system such as the reflection mirror 119 and the projection lens 120, and the CCD 121 are composed of parts such as glass that are weak against vibration and impact, and these external forces do not act on the direct parts. It must be fixed to the substrate 118. In addition, when fixing metal and glass parts, it is necessary to prevent damage to the glass parts due to the difference in thermal expansion coefficient between the two. Therefore, in general, an elastic adhesive such as an elastic adhesive that maintains elasticity even when cured is used for fixing the above-mentioned components. However, such an adhesive has a drawback that it takes a long time to cure and the process cost increases.

The present invention has been made in view of such a situation, and can reliably block harmful rays, stably hold optical components, and reduce process cost. An object of the present invention is to provide an image input device capable of performing the above.

[0009]

[Means for Solving the Problems]

 The image input device according to claim 1 is a light source 5 for illuminating a document 3, a CCD 9 as an image pickup device for reading image information of a document image illuminated by the light source 5, and projecting image information on the CCD 9. In the image input device including the projection optical system 11, a light shielding plate 12 that shields the CCD 9 and the projection optical system 11 from harmful rays 15 and 16 is fixed to the chassis 6 of the apparatus, and the CCD 9 and the projection optical system 11 are shielded by the light shielding plate 12. And the chassis 6 are arranged.

The image input device according to the second aspect is characterized in that the light shielding plate 12 holds the projection optical system 11 and the CCD 9.

The image input device according to a third aspect is characterized in that the light shielding plate 12 is made of an elastic member.

[0012]

[Action]

 In the image input device having the above structure, since the light shielding plate 12 covers the CCD 9 and the projection optical system 11, it is possible to reliably block the harmful rays 15 and 16. Further, by configuring the light shielding plate 12 with an elastic member and holding the projection optical system 11 and the CCD 9, these components can be elastically pressed against the chassis 6, and vibration, shock, thermal strain, and contraction can occur. Can be stably held against.

[0013]

【Example】

 An embodiment of the image input device of the present invention will be described below with reference to the drawings.

1 to 5 show the configuration of an embodiment of the present invention. 1 and 5, a front panel 2 of a housing 1 of the apparatus is provided with an opening 2a for inserting and taking out a document 3. A document holding member 4 is provided in the housing 1 so as to face the opening 2a so as to be movable in the horizontal direction, and the document holding member 4 holds the document 3. Further, a light source 5 for illumination is provided below the document holding member 4 to vertically irradiate the document 3 from below.

A chassis 6 is attached to an inner surface of an upper portion of the housing 1, and the chassis 6 is provided with a rib 6a vertically protruding downward and a substantially rectangular opening 6b. Between the inner surface of the chassis 6 and the rib 6a, two orthogonal sides of the 45-degree reflecting mirror 7 are in contact, and the opening 6b is in contact with the outer periphery of the projection lens 8. Further, a sensor holder 10 holding a CCD 9 is attached to the right end of the chassis 6 in the figure.

On the other hand, below the projection optical system 11 and the sensor holder 10 formed by the reflection mirror 7 and the projection lens 8, a light shielding plate 12 formed of an elastic member is provided. As shown in FIGS. 3 and 4, the light shielding plate 12 is fixed by screws 13 to a pair of left and right ribs 6C provided on the lower surface of the chassis 6 so as to project in parallel with the optical axis direction. A pair of left and right tongues 12a is formed near the left end of the light shielding plate 12 in the figure. As shown in FIG. 2, the tongues 12a are bent upward so that the glass mirror 7 is placed on the inner surface of the chassis 6. It is elastically pressed and held.

A rectangular step portion 12b is formed at the center of the light shielding plate 12, and the periphery of the step portion 12b is a tapered surface 12c protruding downward. The outer periphery of the projection lens 8 is in contact with the inner surface of the step portion 12b, and is pressed and held in the opening 6b of the chassis 6 by the elasticity of the light shielding plate 12. The sensor holder 10 is sandwiched between the right end 12d of the shading plate 12 in the figure and the inner surface of the chassis 6, and is held by the elasticity of the shading plate 12. In this state, the projection lens 8 and the CCD 9 are arranged on the optical axis 14 of the image information of the original document 3 irradiated with the light emitted from the light source 5 shown in FIG.

According to the present embodiment, the projection optical system 11 including the reflection mirror 7 and the projection lens 8 and the CCD 9 are covered with the light shielding plate 12, so that the disturbance light ray 15 incident from the opening 2 a of the panel 2 Alternatively, it is possible to reliably block harmful rays such as the rays 16 emitted from the light source 5 other than the image information from entering the projection optical system 11 and the CCD 9. In addition, dust and the like can be prevented from adhering to the dust, and a dustproof effect can be obtained. As a result, deterioration of image information can be prevented.

On the other hand, since the light shielding plate 12 can be used as a holding member for the optical component, the cost can be reduced as a result. Moreover, since no adhesive is used to fix the optical parts to the chassis 6, the parts can be easily attached and detached during maintenance. Further, since the light shielding plate 12 is made of an elastic member, it is possible to stably hold the optical component against vibration, shock, thermal strain, contraction and the like. That is, even when an external force acts on the reflection mirror 7, the projection lens 8, the CCD 9, etc., the external force can be absorbed by the respective parts 12a, 12b, 12c, 12d of the light shielding plate 12 and the damage of each optical component is prevented. be able to. Further, even if the reflection mirror 7 thermally expands due to the ambient temperature, it can be followed by the deformation of the tongue piece 12a of the light shielding plate 12.

[0020]

[Effect of device]

 As described above, according to the image input device of the present invention, the image sensor and the projection optical system are covered with the elastic light shield plate fixed to the chassis, and the image sensor and the projection optical system are elastically covered by the light shield plate. Since it is held in place, it is possible to reliably block harmful rays, prevent damage to the optical components due to external forces, etc., and also facilitate attachment / detachment of the optical components to reduce process costs.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing the configuration of an embodiment of an image input device of the present invention.

FIG. 2 is an enlarged vertical sectional view of a main part of FIG.

3 is a partial cross-sectional plan view of FIG.

4 is a cross-sectional view taken along the line AA of FIG.

5 is an external perspective view of FIG. 1. FIG.

FIG. 6 is an external perspective view showing a state in which a light shielding plate of an example of a conventional image input device is opened.

7 is an external perspective view showing a state in which the light shielding plate of FIG. 6 is closed.

FIG. 8 is an exploded perspective view showing the configuration of another example of the conventional image input device.

9 is an assembled perspective view of FIG. 8. FIG.

[Explanation of symbols]

 3 Originals 5 Light Source 6 Chassis 9 CCD (Imaging Device) 11 Projection Optical System 12 Light-Shielding Plates 15 and 16 Harmful Rays

Claims (3)

[Scope of utility model registration request] 1. An image input device comprising: a light source for illuminating a document; an image sensor for reading image information of a document image illuminated by the light source; and a projection optical system for projecting the image information onto the image sensor. A light-shielding plate that shields the image pickup device and the projection optical system from harmful rays is fixed to the chassis of the apparatus, and the image pickup device and the projection optical system are arranged between the light-shielding plate and the chassis. Image input device. 2. The image input device according to claim 1, wherein the light blocking plate holds the projection optical system and the image pickup device. 3. The image input device according to claim 1, wherein the light shielding plate is made of an elastic member.