Optical device

Abstract

To suppress radiation noise from a reading unit of a contact optical system while reducing the weight compared to a case in which the entire reading device is enclosed in a metal housing.SOLUTION: An image reading device 1 as a light emitting device to which the present embodiment is applied includes a main body portion 10 in which a CIS 12 of a close-contact optical system type having an image sensor that reads light focused by a lens is disposed inside, and a document table glass 13 and first grounding members 141 and 142 are disposed on a surface 111, and a shielding section 20 in which second grounding members 241 and 242 are disposed which come into contact with and are grounded to each of the first grounding members 141 and 142 when closed by a user, and which are separated from and released from the first grounding members 141 and 142 when opened by the user.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to an optical device. [Background technology]

[0002] There is known a technology for reading an original document using a contact optical reading unit configured to include a microlens array that collects light from a light source and a light receiving substrate having an image sensor that reads the collected light (for example, Patent Document 1). A reading device having a contact optical reading unit is mainly used as a low-speed household machine because the entire device is made of resin to achieve light weight, but it can also be used as a medium-speed commercial machine by increasing the drive frequency. However, as the drive frequency increases, the radiated noise becomes stronger, increasing the risk of electromagnetic interference. One method for suppressing radiated noise is, for example, to surround the source of the radiated noise with a metal housing. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2015-186132 A Summary of the Invention [Problem to be solved by the invention]

[0004] A reading device with a contact optical reading unit has a glass document table on top, so it is difficult to design the entire reading device in a metal housing. Furthermore, using a metal housing would increase the weight, which would defeat the advantage of the contact optical system, which is to reduce weight by making the housing out of resin.

[0005] An object of the present invention is to suppress radiation noise from a reading unit of a contact optical system while reducing the weight compared to a case in which the entire reading device is enclosed in a metal housing. [Means for solving the problem]

[0006] The invention described in claim 1 is an optical device characterized by having a main body portion having a close-contact optical system type reading unit disposed therein and an image sensor that reads light focused by a lens, and a document table glass and a first grounding member disposed on an upper surface, and a shielding portion having a second grounding member disposed thereon that contacts and grounds the first grounding member when the user closes the cover and moves away from the first grounding member to release the grounding when the user opens the cover. The invention described in claim 2 is the optical device described in claim 1, characterized in that the combination of the first grounding member and the second grounding member in a contact state by the closing operation is respectively positioned near both ends of the reading unit. The invention described in claim 3 is the optical device described in claim 2, characterized in that the combination is disposed on the outside of each of both ends of the reading unit. The invention described in claim 4 is the optical device described in claim 2, characterized in that the combinations are each disposed in the vicinity of an edge of the document table glass. The invention described in claim 5 is the optical device described in claim 1, characterized in that the first grounding member and the second grounding member are made of metal members having flat contact surfaces. The invention described in claim 6 is the optical device described in claim 5, characterized in that at least one of the first grounding member and the second grounding member that are in contact with each other is made slidable by the pressing force generated when they come into contact. The invention described in claim 7 is the optical device described in claim 1, characterized in that the shielding portion has an automatic document feeding function. An eighth aspect of the present invention is the optical device according to the seventh aspect, characterized in that the shielding portion is capable of automatically feeding a document exceeding A4 size. Effect of the Invention

[0007] According to the present invention of claim 1, when the shielding unit is closed, the first grounding member and the second grounding member come into contact with each other and are grounded. This makes it possible to suppress radiation noise from the reading unit without enclosing the entire device in a metal housing. According to the present invention of claim 2, the combination of the first ground member and the second ground member in a state of contact by the closing operation is disposed near both ends of the reading unit, respectively, thereby making it possible to suppress radiation noise from the reading unit. According to the present invention of claim 3, the combination of the first ground member and the second ground member is disposed on the outside of both ends of the reading unit. This causes the combination of the first ground member and the second ground member to surround the reading unit. As a result, radiation noise from the reading unit can be suppressed more efficiently than when the combination of the first ground member and the second ground member does not surround the reading unit. According to the present invention of claim 4, the combination of the first ground member and the second ground member is disposed near the edge of the platen glass. This causes the combination of the first ground member and the second ground member to surround the reading unit disposed inside the platen glass. As a result, radiation noise from the reading unit can be suppressed more efficiently than when the combination of the first ground member and the second ground member does not surround the reading unit. According to the present invention of claim 5, the first ground member and the second ground member are made of metal members having flat contact surfaces, which reduces the risk of injury or damage to clothing even if the body of a user performing a closing or opening operation on the shielding unit touches the ground members. According to the present invention of claim 6, at least one of the first ground member and the second ground member that are in contact with each other slides due to a pressing force generated when the first ground member and the second ground member are in contact with each other. This allows the first ground member and the second ground member to be in close contact with each other, thereby preventing poor contact. According to the seventh aspect of the present invention, the shielding portion has an automatic document feed function, so that the movement range of the reading portion is limited, and therefore the number of ground members to be arranged can be limited. According to the present invention of claim 8, the shielding part enables automatic feeding of documents larger than A4 size. This makes it possible to suppress radiation noise from the reading part that enables reading of large documents larger than A4 size by increasing the driving frequency. [Brief description of the drawings]

[0008] [Figure 1] 1 is a perspective view showing an example of a schematic configuration of an image reading device as an optical device to which the present embodiment is applied; [Diagram 2] 1A is a front view showing an example of a schematic configuration of an image reading device, and FIG.1B is a side view showing an example of a schematic configuration of an image reading device. [Diagram 3] 1A is a graph showing the magnitude of radiation noise of a conventional image reading device that does not have a ground member, and FIG. 1B is a graph showing the magnitude of radiation noise of an image reading device according to the present embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. <Image reader> FIG. 1 is a perspective view showing an example of a schematic configuration of an image reading device 1 as an optical device to which the present embodiment is applied. Fig. 2(A) is a front view showing an example of a schematic configuration of the image reading device 1. Fig. 2(B) is a side view showing an example of a schematic configuration of the image reading device 1. 1, 2(A) and (B) is a device also called a scanner or a multifunction device, and reads an image formed on a document 100. The image reading device 1 is configured to include a main body unit 10 and a shielding unit 20.

[0010] (Main body) The main body 10 is configured to include a housing 11, a CIS (Contact Image Sensor) 12, and a document table glass 13. The housing 11 has an upper surface 111 in the vertical direction, a lower surface 112 in the vertical direction, a front surface 113 in the main scanning direction, a rear surface 114 in the main scanning direction, a first side surface 115 in the sub-scanning direction, and a second side surface 116 in the sub-scanning direction, and is a housing that can accommodate various devices and members inside. The housing 11 is mostly made of resin to reduce weight and cost.

[0011] The CIS 12 is a device disposed inside the housing 11, and reads an image formed on the original 100 sent to the original platen glass 13. The CIS 12 functions as a reading section of a contact optical system type having an image sensor (not shown) that reads light collected by a lens (not shown). The original platen glass 13 is a glass member disposed on a part of the surface 111 of the housing 11, and functions as an original platen that supports the original 100 to be read by the CIS 12.

[0012] The size of each of the CIS 12 and the platen glass 13 is determined according to the size of the readable original 100 and is not particularly limited. For example, the length of each of the CIS 12 and the platen glass 13 in the main scanning direction may be set to about 300 mm (millimeters) so that the reading process of the original 100 of A3 size can be performed.

[0013] (Grounding material for main body) 1, 2(A) and 2(B), a plate-shaped metal member 14 is disposed near an end of a first side in the sub-scanning direction of a surface 111 of a housing 11 constituting a main body 10. Ground members 141 and 142 as first ground members are disposed on the front and rear sides, respectively, of the metal member 14 in the main scanning direction. The specific positions of the ground members 141 and 142 are outside both ends of the CIS 12 in the main scanning direction and near the edges of the platen glass 13 (both ends of the platen glass 13 in the main scanning direction, which are the ends on the first side in the sub-scanning direction).

[0014] The ground members 141 and 142 are metallic members having a substantially rectangular parallelepiped shape, and are constituted by metallic gaskets or the like. When the shielding unit 20 is closed, the ground members 141 and 142 come into contact with the ground members 241 and 242 of the shielding unit 20, which will be described later. The upper surface of each of the ground members 141 and 142 in the vertical direction is flat and slightly higher than the metallic member 14. Specifically, the upper surface of each of the ground members 141 and 142 is higher than the metallic member 14 by about several mm (millimeters) in the vertical direction.

[0015] (shielding part) The shielding unit 20 is disposed on the upper side of the main body unit 10 in the up-down direction, and shields the document table glass 13 of the main body unit 10 when the user closes it, and releases the shielding of the document table glass 13 when the user opens it. The shielding unit 20 is configured to include a housing 21 and an ADF (Automatic Document Feeder) 22. Note that Fig. 1 shows a state in which the user has performed an opening operation on the shielding unit 20, and Figs. 2(A) and (B) show a state in which the user has performed a closing operation on the shielding unit 20.

[0016] That is, in the image reading device 1, the shielding unit 20 and the main body unit 10 are connected via a hinge (not shown) or the like, so that the user can open and close them. Specifically, in a state where a closing operation is performed, a rear end in the main scanning direction of a lower surface 212 of the shielding unit 20 in the vertical direction and a rear end in the main scanning direction of an upper surface 111 of the main body unit 10 in the vertical direction are connected via a hinge or the like.

[0017] The housing 21, when closed, has an upper surface 211 in the vertical direction, a lower surface 212 in the vertical direction, a front surface 213 in the main scanning direction, a rear surface 214 in the main scanning direction, a first side surface 215 in the sub-scanning direction, and a second side surface 216 in the sub-scanning direction, and is a housing in which various devices and members can be arranged inside. The housing 21 is mostly made of resin to reduce weight and cost. The ADF 22 is an automatic document feeder that sends the document 100 to a reading position on the document table glass 13 of the main body 10, and can automatically feed the document 100 of B5 size, B4 size, A3 size, etc.

[0018] (Grounding material for shielding part) 1, 2(A) and 2(B), a plate-shaped metal member 24 is disposed near the end of the first side in the sub-scanning direction of the surface 212 of the housing 21 constituting the shielding unit 20. On the front and rear sides in the main scanning direction of the metal member 24, ground members 241 and 242 as second ground members are disposed, respectively. When the shielding unit 20 is closed, the positions of the ground members 241 and 242 are outside both ends in the main scanning direction of the CIS 12 of the main body 10 and near the edges of the document table glass 13 of the main body 10 (both ends in the main scanning direction of the document table glass 13 and the ends on the first side in the sub-scanning direction).

[0019] The ground members 241 and 242 are metallic members having a substantially rectangular parallelepiped shape, and are constituted by metallic gaskets or the like. The ground members 241 and 242 come into contact with the ground members 141 and 142 of the main body 10, respectively, when the shielding unit 20 is in a closed state. The lower surface of each of the ground members 241 and 242 in the vertical direction is flat and slightly higher than the metallic member 24. Specifically, the lower surface of each of the ground members 241 and 242 is higher than the metallic member 24 by about several mm (millimeters) downward in the vertical direction.

[0020] <Earth> 2A and 2B, when the reading process of the original 100 set in the ADF 22 of the shielding unit 20 is started after the user closes the shielding unit 20, the CIS 12 irradiates light 200 toward the original 100 and receives the reflected light to read the image formed on the original 100. When the light 200 is irradiated from the CIS 12 toward the original 100, noise 300 is emitted from the CIS 12, but since the CIS 12 is grounded by the combination of the grounding member 141 and the grounding member 241, which are in contact with each other, and the combination of the grounding member 142 and the grounding member 242, the emission of the noise 300 is suppressed.

[0021] Fig. 3(A) is a graph showing the magnitude of radiation noise of a conventional image reading device that does not have a ground member, and Fig. 3(B) is a graph showing the magnitude of radiation noise of the image reading device 1 according to the present embodiment. The graph shown in Fig. 3(A) shows maximum value 401 and average value 402 of radiation noise of a conventional image reading device in which a grounding member is not provided, and a predetermined reference value 400 as the allowable magnitude of radiation noise. As shown in Fig. 3(A), in the conventional image reading device, there is no margin between each of maximum value 401 and average value 402 of radiation noise and reference value 400, and there are points where maximum value 401 of radiation noise reaches reference value 400.

[0022] The graph shown in Fig. 3(B) shows maximum value 411 and average value 412 of radiation noise of image reading device 1 according to the present embodiment, and reference value 410 that is predetermined as the allowable magnitude of radiation noise. As shown in Fig. 3(B), image reading device 1 according to the present embodiment has a margin between maximum value 411 and average value 412 of radiation noise and reference value 410. In other words, radiation noise from CIS 12 is suppressed.

[0023] <Other embodiments> Although the present embodiment has been described above, the present invention is not limited to the above-described present embodiment. Moreover, the effects of the present invention are not limited to those described in the above-described present embodiment. For example, the configuration of the image reading device 1 shown in FIG. 1 and FIG. 2(A) and (B) is merely an example for achieving the object of the present invention, and is not particularly limited. It is sufficient that the image reading device 1 is provided with the above-described functions, and the configuration used to realize these functions is not limited to the example shown in FIG. 1 and FIG. 2(A) and (B). Moreover, the contents of the graph showing the magnitude of radiation noise shown in FIG. 3(B) are merely an example.

[0024] For example, in the examples shown in Fig. 1 and Fig. 2(A) and (B) above, the vertical heights of the ground members arranged on the main body 10 and the shielding part 20 of the image reading device 1 are both fixed, but this is not limiting. For example, at least one of the ground members arranged on the main body 10 and the shielding part 20 may be made slidable by a pressing force generated upon contact, so that the vertical height can be changed. In this case, for example, a spring mechanism may be provided on at least one of the ground members arranged on the main body 10 and the shielding part 20 to move them up and down upon contact and separation.

[0025] Also, for example, the vertical heights of the ground members arranged on the main body 10 do not have to be uniform. That is, the vertical heights of the ground members 141 and 142 may differ from each other. In this case, the heights of the ground members 241 and 242 correspond to the vertical heights of the ground members 141 and 142.

[0026] 1 and 2, two ground members are provided on each of the main body 10 and the shielding portion 20, but the present invention is not limited to this. For example, three or more ground members may be provided on each of the main body 10 and the shielding portion 20.

[0027] (Additional Note) (((1))) a main body having a contact optical system type reading unit disposed therein and having an image sensor for reading light collected by a lens, and a document table glass and a first grounding member disposed on an upper surface thereof; A shielding section in which a second grounding member is disposed, the second grounding member being brought into contact with the first grounding member by a closing operation by a user and being separated from the first grounding member by an opening operation by the user to release the grounding; An optical device comprising: (((2))) A combination of the first ground member and the second ground member in a contact state by the closing operation is disposed near both ends of the reading unit, 1. The optical device according to claim 1 . (((3))) The combination is disposed on the outside of both ends of the reading unit, The optical device according to (((2))). (((4))) The combinations are each disposed near an edge of the document table glass. 2. An optical device according to claim 1, wherein the optical device is an optical device according to claim 1. (((5))) The first ground member and the second ground member are made of a metal member having a flat contact surface. 1. An optical device according to any one of ((1))) to (((4))). (((6))) At least one of the first grounding member and the second grounding member that are in contact with each other is slidable by a pressing force generated when the first grounding member and the second grounding member are in contact with each other. The optical device according to (((5))). (((7))) The shielding portion has an automatic document feed function. 1. An optical device according to any one of ((1))) to (((6))). (((8))) The shielding section is characterized in that it can automatically feed documents larger than A4 size. The optical device according to (((7))).

[0028] According to the present invention (((1))), when the shielding unit is closed, the first grounding member and the second grounding member come into contact with each other and are grounded. This makes it possible to suppress radiation noise from the reading unit without having to enclose the entire device in a metal housing. According to the present invention (((2))), the combination of the first ground member and the second ground member that are in contact with each other by the closing operation is disposed near both ends of the reading unit, respectively. This makes it possible to suppress radiation noise from the reading unit. According to the present invention (((3))), the combination of the first ground member and the second ground member is disposed on the outside of both ends of the reading unit. This causes the combination of the first ground member and the second ground member to surround the reading unit. As a result, radiation noise from the reading unit can be suppressed more efficiently than when the combination of the first ground member and the second ground member does not surround the reading unit. According to the present invention (((4))), the combination of the first ground member and the second ground member is disposed near the edge of the platen glass. This causes the combination of the first ground member and the second ground member to surround the reading unit disposed inside the platen glass. As a result, radiation noise from the reading unit can be suppressed more efficiently than when the combination of the first ground member and the second ground member does not surround the reading unit. According to the present invention (((5))), the first grounding member and the second grounding member are made of metal members having flat contact surfaces, which reduces the risk of injury or damage to clothing even if the user's body touches the grounding members while closing or opening the shielding unit. According to the present invention (((6))), at least one of the first grounding member and the second grounding member that are in contact with each other slides due to a pressing force generated when the first grounding member and the second grounding member are in contact with each other. This allows the first grounding member and the second grounding member to be in close contact with each other, thereby preventing poor contact. According to the present invention (((7))), since the shielding portion has an automatic document feeding function, the movement range of the reading portion is limited, and therefore the number of ground members to be arranged can be limited. According to the present invention (((8))), the shielding section enables automatic feeding of documents larger than A4 size. This makes it possible to suppress radiation noise from the reading section that enables reading of large documents larger than A4 size by increasing the drive frequency. [Explanation of symbols]

[0029] 1... image reading device, 10... main body, 11... housing, 12... CIS, 13... manuscript glass, 14... metal member, 20... shielding section, 21... housing, 22... ADF, 24... metal member, 100... manuscript, 141, 142... ground member, 241, 242... ground member, 300... noise

Claims

1. a main body having a contact optical system type reading unit disposed therein and having an image sensor for reading light collected by a lens, and a document table glass and a first ground member disposed on an upper surface thereof; a shielding portion in which a second grounding member is disposed, the second grounding member being brought into contact with the first grounding member by a closing operation by a user and being separated from the first grounding member by an opening operation by the user to release the grounding; An optical device comprising:

2. A combination of the first ground member and the second ground member in a contact state due to the closing operation is disposed near both ends of the reading unit, 2. The optical device of claim 1.

3. The combination is disposed on the outside of both ends of the reading unit, 3. The optical device according to claim 2.

4. The combinations are each disposed near an edge of the document table glass.

3. The optical device according to claim 2.

5. The first ground member and the second ground member are made of a metal member having a flat contact surface.

2. The optical device of claim 1.

6. At least one of the first grounding member and the second grounding member that are in contact with each other is slidable by a pressing force generated when the first grounding member and the second grounding member are in contact with each other.

6. The optical device according to claim 5.

7. The shielding portion has an automatic document feed function.

2. The optical device of claim 1.

8. The shielding section is characterized in that it can automatically feed documents larger than A4 size.

8. The optical device according to claim 7.

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