JP2009246663A - Image sensor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an image sensor for efficiently receiving light emitted from a light source and ensuring radiation efficiency or radiation angle accuracy of the light source even in a long reading region. <P>SOLUTION: An image sensor comprises: a light source 2 extending in a main scanning direction; a lens 4 for converging reflection light of a document 1 irradiated with the light source 2; a light-receiving section 5 for receiving the light converged by the lens 4; a heat radiating plate 8 which includes a projecting portion 8a for placing the light source 2 in a recessed portion on a front side, forms a notched portion 8b in the main scanning direction at a terminal part of a rear side and comprises an erected wall portion 8c orthogonal to the notched portion 8b at the rear side; and a housing 9 which houses the heat radiating plate 8 and the light source 2 by providing a hollow region 9b, comprises an abutting portion 9c to abut the projecting portion 8a of the heat radiating plate 8 at a side-wall side to form a light radiation path of the light source 2 and includes a plurality of screw hole portions 9a through the erected wall portion 8c. A screw 10 is abutted to the erected wall portion 8c and fastened by sliding the notched portion 8b of the heat radiating plate 8 in a sub scanning direction along the hollow wall surface of the housing 9. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an image sensor equipped with an LED light source or the like.

  As means for illuminating the original surface uniformly and accurately, it is desired to increase the irradiation efficiency of the light to be irradiated and the accuracy of the irradiation angle generated when the light source is attached. For example, in FIG. 1 of JP-A-8-340419 (refer to Patent Document 1), a light source fixing side wall portion 10 in which a light source portion for irradiating light on the surface of a document 2 is disposed obliquely with respect to the surface of the document 2 and the light source portion to the document. There is disclosed a contact image sensor including a frame 3 formed with condensing side wall surface portions 11a and 11b extending on both sides toward two reflecting surface portions.

  FIG. 4 (see Patent Document 2) of Japanese Patent Laid-Open No. 7-135548 is an image sensor provided with two reflectors 4 ′ at positions along the optical path of light emitted from the LED array 3 ′. What is fixed to the frame 1 'on the optical path side of the array 3' is disclosed.

JP-A-8-340419 (FIG. 1)

Japanese Patent Laid-Open No. 7-135548 (FIG. 4)

However, since the light of the peripheral part diffuses and reflects according to the shape of the frame part 3, the thing of patent document 1 is the attachment structure of the LED array 4 and the frame part 3 although the illumination intensity of the reflective surface of the original document 2 increases. No details are mentioned.

  Although the thing of patent document 2 irradiates a to-be-read object without reducing a light quantity, the detail of the attachment part of LED array I3 'and flame | frame 1' is not mentioned.

  The present invention has been made to solve the above-described problems, and efficiently receives the light emitted from the light source and ensures the light source irradiation efficiency and the accuracy of the irradiation angle even in a long reading region. It is an object of the present invention to provide an image sensor that can be used.

  According to a first aspect of the present invention, there is provided an image sensor comprising: a light source provided on a substrate extending in a main scanning direction for reading an original; a lens for converging reflected light of the original irradiated with the light source; A light receiving portion for receiving the light and a projection portion for placing the light source in the recess portion on the front surface side, and forming a notch portion in the main scanning direction along the end portion on the back surface side. A heat sink provided with a standing wall portion orthogonal to the back surface on the back side, and the heat sink and the light source are provided with a hollow region, and the protrusion of the heat sink is formed on the side wall forming the light irradiation path of the light source. A housing having a plurality of screw hole portions penetrating perpendicularly to the standing wall portion and being inserted into the screw hole portion of the housing, and abutting against the standing wall portion, Slide the notch of the heat sink along the hollow wall surface of the housing in the sub-scanning direction. Is allowed in which and a screw for coupling the contact portion of the casing and the projection of the radiator plate.

  According to a second aspect of the present invention, there is provided an image sensor comprising: a light source provided on a substrate extending in a main scanning direction for reading an original; a lens for converging reflected light of the original irradiated with the light source; A light receiving portion for receiving the light and a projection portion for placing the light source in the recess portion on the front surface side, and forming a notch portion in the main scanning direction along the end portion on the back surface side. A heat sink having a standing wall portion on the back side having a surface forming a narrow angle with the surface of the portion, and the heat sink and the light source are provided with a hollow region to form a light irradiation path of the light source. A housing having a plurality of screw hole portions that are inclined to penetrate the surface of the standing wall portion and provided in contact with the protrusions of the heat sink on the side wall side, and inserted into the screw hole portions of the housing The notch portion of the heat sink is abutted against the standing wall portion to the hollow wall surface of the housing What is obtained by a screw to slide in the sub-scanning direction connecting the contact portion of the housing and the projection of the radiator plate.

  An image sensor according to a third aspect of the present invention is the image sensor according to the first or second aspect, wherein the substrate on which the light source is mounted is divided into a plurality of portions and abuts each other at adjacent end portions.

  According to the image sensor of the first aspect, the structure in which the notch portion of the heat sink is slid in the sub-scanning direction in contact with the housing to couple the protrusion of the heat sink and the contact portion of the housing. Therefore, it is possible to accurately set the irradiation position and irradiation angle of the light source at a predetermined position determined by the casing, and there is an effect of obtaining an image sensor that ensures the irradiation efficiency and irradiation angle accuracy of the light source.

  According to the image sensor of the second aspect, the surface of the standing wall portion of the heat radiating plate and the inclined screw hole portion are provided, and the projecting portion of the heat radiating plate and the contact portion of the housing are coupled by abutting the screw against the standing wall portion. Therefore, in addition to the effect of the first aspect, it is possible to obtain an image sensor capable of preventing a decrease in assembly accuracy due to the influence of the weight of the heat sink even under various assembly conditions and states.

  According to the image sensor of the third aspect, since the substrate on which the light source is mounted is divided into a plurality of parts and brought into contact with each other at adjacent ends, the light source is arranged at an equal pitch, so that a long reading region is obtained. In addition, there is an effect that it is possible to obtain a long image sensor that prevents an increase in cost due to the specialization of the light source and prevents a decrease in irradiation accuracy due to an increase in length.

Embodiment 1 FIG.
Embodiment 1 of the present invention will be described below with reference to FIG. FIG. 1 is a cross-sectional view of the image sensor according to the first embodiment. In FIG. 1, reference numeral 1 denotes a reading document (irradiated body), 2 denotes a light source in which LED chips and the like are arranged in an array on a substrate that irradiates the document 1, 2a denotes an LED chip, 2b denotes an LED chip 2a. It is a mounted board. 3 is a transmitting body that transmits light, 4 is a lens body configured by a rod lens array that converges light reflected by the document 1, and 5 is a main scanning direction for receiving light converged by the lens body 4 (reading of the document 1). A light receiving section (sensor IC) which is a photoelectric conversion element linearly arranged in the width direction), 6 is a sensor substrate on which the sensor IC 5 is mounted, 7 is an electronic component such as a capacitor mounted on the sensor substrate 6, and 8 is a light source 2. 8a is a protrusion provided in the main scanning direction at both ends on the front surface side of the heat radiating plate 8, and 8b extends in the main scanning direction on the back surface side end of the heat radiating plate 8. A notch portion 8 c provided and a standing wall portion provided on the back side of the heat sink 8. The light source 2 is fixed to a recess (flat part) inside the protrusion on the surface side of the heat radiating plate 8 with a screw or the like.

  Reference numeral 9 denotes a housing made of metal or the like, and accommodates the heat sink 8 on which the lens body 4, the sensor substrate 6 and the light source 2 are placed. 9a is a screw hole provided in the side surface of the housing 9, 9b is a hollow portion (hollow region) of the housing 9 that houses the light source 2 and the heat sink 8, and 9c is a contact provided in the hollow portion 9b of the housing 9. Reference numeral 9 d denotes a mounting table for the housing 9 that holds the sensor substrate 6. A screw 10 is inserted into the screw hole 9a of the housing 9 to move (slide) the heat radiating plate 8 so that the projection 8a of the heat radiating plate 8 and the contact portion 9c of the housing 9 are brought into contact with each other to be coupled. It is. In the drawings, the same reference numerals indicate the same or corresponding parts.

  FIG. 2 is a side view of the image sensor shown in FIG. 1, and 11 is an external connector for inputting / outputting power and signals including the light source 2 to the image sensor. In the figure, the same reference numerals as those in FIG. 1 denote the same or corresponding parts.

  FIG. 3 is a plan view of the light source placed on the heat sink of the image sensor according to the first embodiment. In FIG. 3, 12 is a screw for fixing the substrate 2b and the heat radiating plate 8, 13 is a connector that receives power supply from an external connector 11 that supplies power to the light source 2, and in the first embodiment, two sets of light sources 2 are provided. Are placed on a set of heat sinks 8. In the figure, the same reference numerals as those in FIG. 1 denote the same or corresponding parts.

  Next, the operation will be described with reference to FIGS. Light emitted from the light source 2 passes through the transmissive body 3 and is concentrated on the reading position (irradiation region) of the irradiated object 1 where uniform illumination light is conveyed in the sub-scanning direction (conveyance direction of the document 1). .

  The light reflected by the image information on the original surface is converged by the rod lens array 4, and the reflected light converged by the rod lens array 4 is photoelectrically converted by the light receiving unit 5 of the sensor substrate 6. A large number of LED chips 2a are arranged in the light source 2 at a pitch of 9.7 mm, and the two light sources 2 have a reading area of about A0 size. The arrangement pitch of the LED chips 2a is preferably the same even if the light sources 2 are divided from each other. In the first embodiment, a light source connector 13 is provided at one end, and the light sources 2 are brought into contact with each other with point symmetry. A 9.7 mm pitch is secured.

  FIG. 4 is a partial enlarged cross-sectional view of the illumination system portion for explaining the relationship between the heat sink and the housing on which the light source of the image sensor according to Embodiment 1 of the present invention is placed. In the figure, the same reference numerals as those in FIG. 1 denote the same or corresponding parts.

  A structure in which an irradiation path surrounded by the side wall of the housing 9 is formed between the light source 2 and the document 1 according to the irradiation direction of the LED chip 2a formed on the surface of the substrate 2b, and the document 1 is irradiated with light concentratedly. It has become. A contact portion 9 c is provided in the vicinity of the side wall of the housing 9 provided on the irradiation path side so that the projecting portion 8 a of the heat radiating plate 8 contacts and can be coupled to the housing 9.

  Moreover, since the heat sink 8 on which the light source 2 is placed is housed in the hollow area 9b of the housing 9, the cross section of the hollow area 9b is large. Therefore, a hollow wall surface region is provided in part so as to contact the notch portion 8b of the heat sink 8 and slide along the wall surface of the hollow region 9b flat in the sub-scanning direction, and the standing wall portion 8c of the heat sink 8 orthogonal to this is provided outside. Then, the screw 10 is inserted and tightened to couple the protruding portion 8a of the heat sink 8 and the contact portion 9c of the housing 9.

  From the above, the irradiation angle of the light source 2 determined by the notch 8b of the heat sink 8 and the hollow wall surface of the housing 9 and the contact portion 9c of the housing 9 and the irradiation position with respect to the original surface are uniquely determined. An image sensor that ensures the efficiency and accuracy of the irradiation angle can be obtained.

Embodiment 2. FIG.
In the first embodiment, the standard means for incorporating the heat radiating plate 8 on which the light source 2 is placed into the housing 9 has been described, but in the second embodiment, the case where the heat sink is assembled upside down will be described.

  FIG. 5 is a partial enlarged cross-sectional view of an illumination system portion for explaining the relationship between a heat sink on which a light source of an image sensor according to Embodiment 2 of the present invention is placed and a housing. In FIG. 5, reference numeral 80 denotes a heat radiating plate, and 80 c denotes a standing wall portion of the heat radiating plate 80. When installing upside down, if the standing wall 80c is orthogonal to the notch 8b, the hollow wall may not come into contact with the notch 8b due to the weight of the heat sink 80, so the standing wall 80c has an inclined structure. The heat sink 8 is slid while the hollow wall surface and the notch 8b are brought into contact with each other by abutting the screw 10 against the slope. In the figure, the same reference numerals as those in FIG. 1 denote the same or corresponding parts.

  Even in other built-in states that do not depend on the standard means according to the first embodiment, various built-in means and methods can be obtained by appropriately changing the standing wall portions 8c and 80c and incorporating the heat sinks 8 and 80 into the housing 9. Is also possible.

  From the above, even if there is a change or change in the assembling means, the notched portion 8b of the heat radiating plate 80 and the hollow wall surface of the housing 9 are obtained by appropriately tilting the standing wall portion 80c to obtain the heat radiating plate 80 suitable for the assembled state The irradiation angle of the light source 2 determined by the contact portion 9c of the housing 9 and the irradiation position with respect to the document surface are uniquely determined, and an image sensor that ensures the irradiation efficiency of the light source and the accuracy of the irradiation angle can be obtained.

  In the first to third embodiments, the protrusions 8a of the heat sinks 8 and 80 are installed on both sides of the recess. However, even if the protrusion 8a that determines the reference position depending on the assembly conditions / states is used as one position, There is a corresponding effect on the accuracy of the irradiation angle.

It is sectional drawing of the image sensor by Embodiment 1 of this invention. It is a side view of the image sensor by Embodiment 1 of this invention. It is a top view of the light source mounted in the heat sink of the image sensor by Embodiment 1 of this invention. It is a partial expanded sectional view of the illumination system part explaining the relationship between the heat sink and the housing | casing which mount the light source of the image sensor by Embodiment 1 of this invention. It is the elements on larger scale of the illumination system part explaining the relationship between the heat sink and the housing | casing which mount the light source of the image sensor by Embodiment 2 of this invention.

Explanation of symbols

1..Original (irradiated body) 2..Light source 2a..LED chip 2b..Substrate 3..Transparent body 4..Lens body (rod lens array) 5..Light receiving part (sensor IC)
6..Sensor board 7..Electronic component 8..Heat sink 8a..Protrusion 8b..Notch 8c..Standing wall portion 9..Case 9a..Screw hole 9b..Hollow portion (hollow region) )
9c ·· Contact portion 9d · · Mounting base 10 · · Screw 11 · · External connector 12 · · Screw 13 · · · Connector 80 · · Heat sink 80c · · Standing wall

Claims (3)

A light source provided on a substrate extending in the main scanning direction for reading a document, a lens for converging the reflected light of the document irradiated by the light source, a light receiving unit for receiving the light converged by the lens, and a surface A protrusion on which the light source is placed in the depression on the side, a notch is formed in the main scanning direction along the end on the back side, and a standing wall portion orthogonal to the notch is provided on the back side A heat sink, a heat sink and the light source are provided in a hollow area, and a contact portion is provided for contacting the protrusion of the heat sink on the side wall forming the light irradiation path of the light source. A housing having a plurality of screw hole portions penetrating perpendicularly to the upright wall portion, and inserted into the screw hole portion of the housing, and abutted against the upright wall portion so that the notch portion of the heat sink is placed in the housing Slide in the sub-scanning direction along the hollow wall surface of the Image sensor and a screw for coupling the parts. A light source provided on a substrate extending in the main scanning direction for reading a document, a lens for converging the reflected light of the document irradiated by the light source, a light receiving unit for receiving the light converged by the lens, and a surface A projection portion for placing the light source on the side recess, a notch is formed in the main scanning direction along an end on the back side, and a surface that forms a narrow angle with the surface of the notch A heat sink having a standing wall portion provided on the back surface side, and the heat sink and the light source are provided with a hollow region, and the protrusion of the heat sink is abutted against the side wall forming the light irradiation path of the light source. A housing having a plurality of screw hole portions that are provided in contact with each other and are inclined to penetrate the surface of the standing wall portion, and is inserted into the screw hole portion of the housing and is abutted against the standing wall portion to release the heat. The heat release is achieved by sliding the notch of the plate in the sub-scanning direction along the hollow wall surface of the housing. Image sensor provided with a protrusion portion and a screw for coupling the contact portion of the housing. The image sensor according to claim 1, wherein the substrate on which the light source is mounted is divided into a plurality of parts and abuts with each other at adjacent ends.

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