JPH0531446U - Image sensor light-shielding structure for document reader - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide an image sensor light-shielding structure for an original reading device that does not allow entry of ambient light, dust, or dust, and that facilitates position adjustment of an optical unit or an image sensor. In the image sensor light-shielding structure, a hood 6b protruding toward the optical housing 1 is provided in an opening 6a of a sensor support member 6, and a hood surrounding portion 4 surrounding the outer periphery of the hood 6b is provided in the optical housing 1. A first position adjusting mechanism that is provided and that adjusts the position of the optical housing 1 in the optical axis direction of the optical system and in the direction that is displaced with respect to the optical axis, and the sensor support member is displaced with respect to the optical axis direction and the optical axis. A second position adjusting mechanism for adjusting the position in the direction is provided.

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 sensor light-shielding structure for an original reading device which prevents ambient light other than the original surface scanning light from entering the image sensor of the original reading device.

[0002]

[Prior art]

 Conventionally, as an optical system of a document reading apparatus, there is one having a structure shown in FIGS. In FIG. 5, reference numeral 101 denotes an optical housing, and the optical housing 101 is provided with a lens unit 105 at its front portion and a sensor support portion 102 at its rear end portion. The member 103 is fixed. An image sensor 104 composed of a CCD element is attached to the center of the front surface of the sensor attachment member 103. The scanning light L on the original surface is guided to the image sensor 104 through the lens unit 105 and the opening 102a provided in the sensor supporting member 102.

In FIG. 6, reference numeral 201 denotes a dark box type optical housing, a lens unit 202 is attached to a front portion of the optical housing 201, and a sensor attachment member is attached to a rear end portion of the optical housing 201. 203 is fixed, and the image sensor 204 is fixed to the central portion of the front surface of the sensor mounting member 203. The scanning light L on the document surface is guided to the image sensor 204 through the lens unit 202.

[0004]

[Problems to be solved by the device]

 Of the above-mentioned conventional optical systems, the one shown in FIG. 5 has a structure in which ambient light, dust, dust, and the like easily enter when the position of the image sensor 104 is adjusted, and it is difficult to obtain an excellent image for a long period of time. there were. Especially, there was a problem that we had to be careful about ambient light. On the other hand, in the structure shown in FIG. 6, since the optical housing 201 is a dark box type, there is no influence of ambient light, but the adjustment of the deviation direction in the horizontal plane with respect to the optical axis of the image sensor 204 is possible. There was a problem that it was difficult.

The present invention has been made in view of the above points, and provides an image sensor light-shielding structure for a document reading device that does not allow the entry of ambient light, dust, or dust and that facilitates the position adjustment of the optical unit and the image sensor. To do.

[0006]

[Means for Solving the Problems]

 In order to solve the above problems, the present invention is configured so that an image sensor attached to a sensor support member guides scanning light of a document surface through a lens unit provided in an optical housing and an opening provided in the sensor support member. The image sensor light-shielding structure prevents external light from entering the image sensor in the optical system of the document reading device, and a hood protruding toward the optical housing is provided at the opening of the sensor support member and Is provided with a hood surrounding portion that surrounds the outer periphery of the hood, and a first position adjusting mechanism for adjusting the position of the optical housing in the optical axis direction of the optical system and in a direction deviated from the optical axis, and the sensor support member It is characterized in that a second position adjusting mechanism for adjusting the position in the axial direction and the direction deviating from the optical axis is provided.

[0007]

[Action]

 According to the present invention, the hood protruding toward the optical housing is provided in the opening of the sensor support member as described above, and the optical housing is provided with the wall portion surrounding the outer periphery of the hood. The second position adjusting mechanism prevents disturbance light, dust, and dust from entering even if the positions of the optical housing and the sensor support member are adjusted in the optical axis direction and the direction of deviation with respect to the optical axis.

[0008]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view showing an image sensor light-shielding structure of a document reading apparatus according to the present invention. In FIG. 1, reference numeral 1 denotes an optical housing, and the optical housing 1 has a cylindrical portion 3 on a plate-like housing base 2 as shown in the drawing, and a structure to be described later in detail at the rear end of the cylindrical portion 3. The hood surrounding portion 4 is integrally formed, and the lens unit 5 is fitted and fixed inside the front end of the cylindrical portion 3. Reference numeral 6 denotes a sensor support member, and the sensor support member 6 has a plate-like shape and has an opening 6a formed in the center thereof for allowing scanning light to pass therethrough. Further, as shown in FIG. 3, the hood is provided in front of the opening 6a. A tubular hood 6b having a shape to be inserted into the surrounding portion 4 is provided. 2 is a perspective view of the optical housing 1 as seen from the direction of arrow A in FIG. 1, and FIG. 3 is a perspective view of the sensor support member 6 as seen from the direction of arrow A.

An image sensor 8 fixed to a substrate 7 is attached behind the opening 6 a of the sensor support member 6. As described above, in the image sensor light-shielding structure, since the hood 6b of the sensor support member 6 is inserted into the hood surrounding portion 4, the optical housing 1 and the optical housing 1 are configured by the first and second position adjusting mechanisms described in detail later. Even if the position of the sensor support member 6 is adjusted, ambient light does not enter the hood surrounding portion 4 and the hood 6b. In addition, d in FIG. 1 is a clearance for position adjustment.

A plate 10 is disposed between the housing base 2 and the main body base 9 of the optical housing 1, and a hole 11 is provided at one end of the plate 10, a guide pin 12 is provided at the lower center, and a further end is provided at the other end. Is provided with a large diameter hole 13. A guide pin 14 projecting downward is provided at a predetermined position of the housing base 2. The guide pin 14 penetrates a hole 11 at one end of the plate 10 and is inserted into an elongated hole 9a formed in the body base 9. To be done. Further, the guide pin 12 is inserted into the long hole 9b formed in the main body base 9, and further the screw 15 with a washer penetrates the large diameter hole 13 and is screwed into the screw hole 9c formed in the main body base 9. It has become.

FIG. 4 is a plan view of the optical housing 1. As shown in FIGS. 2 and 4, the optical housing 1 is provided with long holes 2a, 2b, 2g and a semi-long hole 2c in its housing base 2, and a pair of small holes 2e, 2e, which sandwich a large hole 2d. 2f is provided. Then, screw holes 9d and 9e are provided at positions corresponding to the elongated holes 2a and 2b of the main body base 9, and holes 9f are provided at positions corresponding to the semi-oblong holes 2c. The major axis direction (major axis direction) of each of the elongated holes 2a, 2b, 9a, 9g coincides with the optical axis direction (Z direction) of the optical system. The long axis direction of the long holes 9b and the semi-long holes 2c coincides with the direction (X direction) orthogonal to the optical axis direction.

Reference numeral 16 is an adjusting jig, and a large diameter hole 16a into which the large diameter shaft 17a of the eccentric pin 17 is inserted is formed in the adjusting jig 16, and a part of the inner circumference of the large diameter hole 16a is formed. A protruding spring member 16b is provided. Further, the adjusting jig 16 is provided at its bottom portion with a pair of pins 16c and 16d fitted into the pair of small diameter holes 2e and 2f. The medium-diameter shaft 17b of the eccentric pin 17 is inserted into the large-diameter hole 2d, and the small-diameter shaft 17c is inserted into the long-diameter hole 9g. The large-diameter shaft 18a of the eccentric pin 18 is fitted in the half-long hole 2c, and the small-diameter shaft 18b is fitted in the small-diameter hole 9f. The screws 19, 20 and 21 with washers pass through the long diameter holes 2a, 2b and 2g, respectively, and their tips are screwed into the screw holes 9d, 9e and 9h (not shown), respectively.

The adjusting jig 16 is attached by inserting its pins 16c and 16d into the small diameter holes 2e and 2f of the housing base 2, and at the same time, the large diameter shaft 17a, the medium diameter shaft 17b and the small diameter shaft 17c of the eccentric pin 17 are attached. Are respectively inserted into the large diameter hole 16a of the adjusting jig 16, the large diameter hole 2d of the housing base 2 and the long diameter hole 9g of the main body base. Further, the large-diameter shaft 18a and the small-diameter shaft 18b of the eccentric pin 18 are inserted into the semi-long hole 2c of the housing base 2 and the small-diameter hole 9f of the main body base 9, respectively.

Since the axis of the large-diameter shaft 18a and the axis of the small-diameter shaft 18b that rotate the eccentric pin 18 in this state are deviated from each other, the direction (X direction) orthogonal to the optical axis direction (Z direction) of the large-diameter shaft 18a. The force acting in the optical axis direction of the optical housing 1 is absorbed by the displacement of the large diameter shaft 18a in the longitudinal direction of the semi-long hole 2c, and the force acting in the optical axis direction acts on the housing base 2. The position of can be adjusted. Further, by rotating the eccentric pin 17, the axis of the medium diameter shaft 17b and the axis of the small diameter shaft 17c are deviated from each other, so that the housing base 2 is rotated about the guide pin 14 and the optical housing 1 is used as the optical axis. On the other hand, it is possible to adjust the position to an eccentric position (α direction). At this time, since the large-diameter shaft 17a of the eccentric pin 17 is biased by the spring member 16b by the elastic force, its rotation is restricted, and the adjusted eccentric pin 17 is prevented from rotating by an external force. .. Further, when the plate 10 is fixed by tightening the screw 15 with a washer exposed in the hole 2h provided in the housing base 2, the guide pin 14 cannot move and the movement in the optical axis direction is restricted. After the position adjustment, the screws with washers 19, 20 and 21 are tightened to fix the optical housing 1 on the main body base 9.

The position adjusting mechanism including the plate 10, the eccentric pin 18, the adjusting jig 16 and the like is a first position adjusting mechanism for adjusting the position of the optical housing 1 in the optical axis direction and in the deviation direction with respect to the optical axis. Become.

The sensor support member 6 is mounted on the housing base 2, and fixing parts 6-1 and 6-2 are provided at both ends of the lower part thereof, and a guide pin 6c is provided at the center of the bottom part. There is. The fixed portion 6-1 is provided with a long hole 6-1a, a large diameter hole 6-1b, a pair of small diameter holes 6-1c and 6-1d, and a semi-long diameter hole 6-1e. The fixing portion 6-2 is provided with a long diameter hole 6-2a. A screw hole 2j, a long hole 2k, and a hole 2l are provided at positions corresponding to the long hole 6-1a, the large diameter hole 6-1b, and the half long hole 6-1e of the fixing portion 6-1 of the housing base 2. Has been. Further, a screw hole 2n is provided at a position corresponding to the long diameter hole 6-2a of the fixed portion 6-2, and a long hole 2m into which the guide pin 6c is inserted is further provided. Reference numeral 22 is an adjusting jig having substantially the same structure as the adjusting jig 16.

The major axis direction (major axis direction) of each of the elongated holes 6-1a, 6-2a, 2k, and 2m coincides with the direction (X direction) orthogonal to the optical axis direction (Z direction). The sensor support member 6 is temporarily fixed on the housing base 2 with screws 25 and 26 with washers (loose the screws 25 and 26). Subsequently, the pins 22c and 22d of the adjusting jig 22 are inserted into the small diameter holes 6-1c and 6-1d, and the adjusting jig 22 is placed on the fixing portion 6-1, and at the same time, the large diameter of the eccentric pin 23 is increased. The shaft 23a, the medium diameter shaft 23b, and the small diameter shaft 23c are inserted into the large diameter hole 22a of the adjustment jig 22, the large diameter hole 6-1b of the fixing portion 6-1, and the long diameter hole 2k of the housing base 2, respectively. Further, the large diameter shaft 24a and the small diameter shaft 24b of the eccentric pin 24 are inserted into the semi-long diameter hole 6-1e of the fixed portion 6-1 and the hole 2l of the housing base 2, respectively.

In the above state, when the eccentric pin 24 is rotated, the sensor support member 6 moves in the direction (X direction) orthogonal to the optical axis direction (Z direction), and therefore the position adjustment in this direction becomes possible. .. Further, by rotating the eccentric pin 23, the sensor support member 6 can be rotated about the guide post 6c to be displaced (α direction) with respect to the optical axis direction (Z direction). After the adjustment, the screws 25 and 26 with washers are tightened to fix the sensor support member 6 on the housing base 2.

The sensor support member 6 is plate-shaped and has an opening 6a formed in the center thereof for allowing scanning light to pass therethrough. Further, as shown in FIG. 3, the opening 6a is formed inside the hood surrounding portion 4 in front of the opening 6a. A tubular hood 6b having a shape to be inserted is provided. The adjusting mechanism including the adjusting jig 22 and the eccentric pin 24 constitutes a second position adjusting mechanism for adjusting the position of the sensor support member 6.

In the above image sensor light-shielding structure, after the position adjustment of the optical housing 1 and the sensor support member 6 is completed and the screws with washers 19, 20, 21, 25, 26 are tightened and fixed, the first position adjustment mechanism is used. It is needless to say that the adjusting jig 16 and the eccentric pin 18 constituting the above, and the adjusting jig 22 and the eccentric pin 24 constituting the second position adjusting mechanism may be removed.

[0021]

[Effect of the device]

 As described above, according to the present invention, the following excellent effects can be obtained. (1) When adjusting the position of the image sensor, the lens unit, etc., the position can be adjusted without being affected by ambient light. (2) It is possible to prevent dust from entering between the lens unit and the image sensor, and it is possible to obtain an excellent image for a long period of time.

[Brief description of drawings]

FIG. 1 is a sectional view showing an image sensor light-shielding structure of a document reading apparatus of the present invention.

FIG. 2 is a perspective view of the optical housing as seen from the direction of arrow A in FIG.

FIG. 3 is a perspective view of the sensor support member as seen from the direction of arrow A in FIG.

FIG. 4 is a plan view of an optical housing.

FIG. 5 is a diagram showing a positional structure example of an optical system of a conventional document reading apparatus.

FIG. 6 is a diagram showing an example of a positional structure of an optical system of a conventional document reading apparatus.

[Explanation of symbols]

 1 Optical Housing 2 Housing Base 3 Cylindrical Part 4 Hood Enclosure 5 Lens Unit 6 Sensor Support Member 7 Substrate 8 Image Sensor 9 Main Body Base 10 Plate 11 Hole 12 Guide Pin 13 Large Diameter Hole 14 Guide Pin 15 Screw with Washer 16 Adjustment Tool 17 eccentric pin 18 eccentric pin 19 screw with washer 20 screw with washer 21 screw with washer 22 adjustment jig 23 eccentric pin 24 eccentric pin 25 screw with washer 26 screw with washer

Claims (1)

[Scope of utility model registration request] 1. A document reading device configured to guide scanning light of a document surface to an image sensor attached to a sensor support member through a lens unit provided in an optical housing and an opening provided in the sensor support member. An image sensor light-shielding structure for preventing invasion of ambient light into the image sensor in an optical system, wherein a hood protruding toward the optical housing is provided in an opening of the sensor support member, and the hood is provided in the optical housing. A first position adjusting mechanism that adjusts the position of the optical housing in the optical axis direction of the optical system and in a direction deviated from the optical axis by providing a hood surrounding portion surrounding the outer periphery of the sensor support member. And a second position adjusting mechanism for adjusting the position in a direction deviated with respect to the optical axis. Light shielding structure.