Optical device

Abstract

An optical device is characterized by comprising: a main body section in which a reading section of a contact optical system type having an image sensor for reading light collected by a lens is disposed, and on which a document table glass and a first ground member are disposed on the upper surface; and a shielding part provided with a second grounding part which is contacted with the first grounding part through closing operation of a user and is grounded, and is separated from the first grounding part through opening operation of the user and is released from the grounding.

Description

Technical Field

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

[0002] It is known that there is a technology for reading a manuscript with a contact optical reading unit, which is composed of 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). The reading device having a contact optical reading unit is lightweight by forming the entire device with resin, so it is mainly used as a low-speed machine for household use, but by increasing the driving frequency, it can also be used as an industrial medium-speed machine, etc. However, if the driving frequency is increased, the radiation noise will become stronger, so the risk of electromagnetic interference will increase. As a method of suppressing radiation noise, there is a method of surrounding the source of radiation noise with a metal frame, etc.

[0003] Patent Document 1: Japanese Patent Application Publication No. 2015-186132

[0004] The reading device with the contact optical reading unit has a glass manuscript table on the upper surface, so it is difficult to design the reading device as a whole with a metal frame. In addition, if a metal frame is used, the weight will increase, and the advantage of the contact optical method that is lightweight by forming the frame with resin cannot be utilized. Summary of the invention

[0005] An object of the present invention is to reduce the weight of a reader device and suppress radiation noise from a contact optical reader unit, compared to a case where the entire reader device is surrounded by a metal frame.

[0006] The invention described in Scheme 1 is an optical device, characterized in that it comprises: a main body, in which a reading unit of a contact optical system is arranged, and a document table glass and a first grounding component are arranged on the upper surface, and the reading unit of the contact optical system has an image sensor that reads light gathered by a lens; and a shielding portion, in which a second grounding component is arranged, and the second grounding component is grounded by contacting with the first grounding component through a closing operation of the user, and is released from the first grounding component through an opening operation of the user.

[0007] 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 state of contact due to the closing operation is respectively arranged near both end portions of the reading section.

[0008] The invention described in claim 3 is the optical device described in claim 2, characterized in that the combination is respectively arranged outside both end portions of the reading portion.

[0009] The invention described in claim 4 is the optical device described in claim 2 or claim 3, characterized in that the combination is respectively arranged near the edge of the original platen glass.

[0010] The invention described in claim 5 is the optical device described in any one of claims 1 to 4, characterized in that the first grounding member and the second grounding member are made of metal members having flat contact surfaces.

[0011] 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 in contact can slide due to a pressing force generated when in contact.

[0012] The invention described in claim 7 is the optical device described in any one of claims 1 to 6, characterized in that the shielding portion has an automatic document feeding function.

[0013] The invention described in claim 8 is the optical device described in claim 7, characterized in that the shielding portion can automatically convey an original larger than A4 size.

[0014] Effects of the Invention

[0015] According to the first aspect of the present invention, when the shielding portion is closed, the first grounding member contacts the second grounding member and is grounded. This makes it possible to suppress radiation noise from the reading portion without surrounding the entire device with a metal frame.

[0016] According to the second aspect of the present invention, the combination of the first ground member and the second ground member in contact with each other by the closing operation is disposed near both ends of the reading section, thereby suppressing radiation noise from the reading section.

[0017] According to the third aspect of the present invention, the combination of the first ground member and the second ground member is respectively arranged outside the two end portions of the reading section. Thus, the combination of the first ground member and the second ground member surrounds the reading section. As a result, compared with the case where the combination of the first ground member and the second ground member does not surround the reading section, the radiation noise from the reading section can be suppressed more efficiently.

[0018] According to the fourth aspect of the present invention, the combination of the first grounding member and the second grounding member is respectively arranged near the edge of the original platen glass. Thus, the combination of the first grounding member and the second grounding member surrounds the reading section arranged inside the original platen glass. As a result, compared with the case where the combination of the first grounding member and the second grounding member does not surround the reading section, the radiation noise from the reading section can be efficiently suppressed.

[0019] According to the fifth aspect of the present invention, the first grounding member and the second grounding member are formed of metal members having flat contact surfaces, thereby reducing the risk of injury or damage to clothing even when the user's body contacts the grounding members while closing or opening the shielding portion.

[0020] According to the sixth aspect of the present invention, at least one of the first and second grounding members in contact slides due to the pressing force generated when in contact. This allows the first and second grounding members to come into contact, thereby preventing contact failure.

[0021] According to the seventh aspect of the present invention, since the shielding portion has an automatic document feeding function, the moving range of the reading portion is limited. Thus, the number of grounding members to be arranged can be limited.

[0022] According to the eighth aspect of the present invention, the shielding unit can automatically convey a document larger than A4 size. This can suppress radiated noise from the reading unit that can read a large document larger than A4 size by increasing the driving frequency. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Embodiments of the present invention will be described in detail with reference to the following drawings.

[0024] Figure 1 is a perspective view showing an example of a schematic structure of an image reading device as an optical device to which the present embodiment is applied;

[0025] Figure 2 (A) is a front view showing an example of a schematic structure of an image reading device, Figure 2 (B) is a side view showing an example of a schematic structure of an image reading device;

[0026] Figure 3 (A) is a graph showing the magnitude of radiation noise of a conventional image reading device that is not provided with a grounding member. Figure 3 (B) is a graph showing the magnitude of radiation noise of the image reading device according to the present embodiment.

[0027] Explanation of symbols

[0028] 1-image reading device, 10-main body, 11-frame, 12-CIS, 13-original table glass, 14-metal component, 20-shielding portion, 21-frame, 22-ADF, 24-metal component, 100-original, 141, 142-ground components, 241, 242-ground components, 300-noise. DETAILED DESCRIPTION

[0029] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[0030] <Image reading device>

[0031] Figure 1 It is a perspective view showing an example of a schematic structure of an image reading device 1 as an optical device to which the present embodiment is applied.

[0032] Figure 2 (A) is a front view showing an example of a schematic structure of the image reading device 1 . Figure 2 (B) is a side view showing an example of a schematic structure of the image reading device 1 .

[0033] Figure 1 , Figure 2 (A) and Figure 2 The image reading device 1 shown in (B) is a device also called a scanner or a multifunction peripheral, and reads an image formed on a document 100. The image reading device 1 includes a main body 10 and a shielding portion 20.

[0034] (Main body)

[0035] The main body 10 is composed of a frame 11, a CIS (Contact Image Sensor) 12, and a document table glass 13. The frame 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 frame in which various devices or components can be arranged. In order to achieve light weight or low cost, most of the frame 11 is made of resin.

[0036] The CIS 12 is a device disposed inside the housing 11, and reads an image formed on the document 100 conveyed to the document table glass 13. The CIS 12 functions as a reading unit of a contact optical system having an image sensor (not shown) that reads light collected by a lens (not shown). The document table glass 13 is a glass member disposed on a part of the surface 111 of the housing 11, and functions as a document table that supports the document 100 to be read by the CIS 12.

[0037] The sizes of the CIS 12 and the document glass 13 are determined according to the size of the document 100 that can be read and are not particularly limited. For example, the length of the CIS 12 and the document glass 13 in the main scanning direction can be set to about 300 mm (millimeter) so that the document 100 of A3 size can be read.

[0038] (Grounding member of the main body)

[0039] like Figure 1 , Figure 2 (A) and Figure 2 As shown in (B), a plate-shaped metal component 14 is arranged near the end of the first side in the sub-scanning direction of the surface 111 of the frame 11 constituting the main body 10. Grounding components 141 and 142 as first grounding components are arranged on the front side and the rear side in the main scanning direction of the metal component 14, respectively. The specific positions of the grounding components 141 and 142 are respectively outside the two ends in the main scanning direction of the CIS 12 and near the edge of the original platen glass 13 (the two ends in the main scanning direction of the original platen glass 13 and the end of the first side in the sub-scanning direction).

[0040] The grounding members 141 and 142 are metal members having a substantially rectangular parallelepiped shape and are formed of metal washers and the like. When the shielding member 20 is closed, the grounding members 141 and 142 are in contact with the grounding members 241 and 242 of the shielding member 20 described later. The upper surface of each of the grounding members 141 and 142 in the vertical direction is flat and slightly higher than the metal member 14. Specifically, the upper surface of each of the grounding members 141 and 142 is higher than the upper side of the metal member 14 in the vertical direction by about several mm (millimeter).

[0041] (Shielding part)

[0042] The shielding portion 20 is disposed on the upper side of the main body 10 in the vertical direction, and shields the document table glass 13 of the main body 10 by a closing operation of the user, and releases the shielding of the document table glass 13 by an opening operation of the user. The shielding portion 20 is configured to include a frame 21 and an ADF (Automatic Document Feeder) 22. Figure 1 The state in which the user performs an opening operation on the shielding portion 20 is shown in FIG. Figure 2 (A) and Figure 2 (B) shows a state where the user performs a closing operation on the shielding portion 20 .

[0043] That is, in the image reading device 1, the shielding portion 20 and the main body 10 are connected via a hinge (not shown) or the like, so that the user can perform an opening and closing operation. Specifically, in a closed state, the rear end of the lower surface 212 of the shielding portion 20 in the vertical direction and the rear end of the upper surface 111 of the main body 10 in the vertical direction are connected via a hinge or the like.

[0044] The frame 21 is a frame that 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 when the closing operation is performed, and various devices or components can be arranged inside. In order to achieve light weight or low cost, most of the frame 21 is made of resin. ADF22 is an automatic document feeder that conveys the document 100 to the reading position on the document table glass 13 of the main body 10, and can automatically convey the document 100 of B5 size, B4 size, A3 size, etc.

[0045] (Grounding member of the shielding part)

[0046] like Figure 1 , Figure 2 (A) and Figure 2 As shown in (B), a plate-shaped metal member 24 is arranged near the end of the first side in the sub-scanning direction of the surface 212 of the frame 21 constituting the shielding portion 20. Grounding members 241 and 242 as second grounding members are arranged on the front side and the rear side in the main scanning direction of the metal member 24, respectively. The positions of the grounding members 241 and 242 in the state where the shielding portion 20 is closed are respectively outside the two ends in the main scanning direction of the CIS 12 of the main body 10 and near the edge of the original platen glass 13 of the main body 10 (the two ends in the main scanning direction of the original platen glass 13 and the end of the first side in the sub-scanning direction).

[0047] The grounding members 241 and 242 are metal members having a substantially rectangular parallelepiped shape and are formed of metal washers and the like. The grounding members 241 and 242 are in contact with the grounding members 141 and 142 of the main body 10, respectively, when the shielding portion 20 is closed. The lower surface of each of the grounding members 241 and 242 in the vertical direction is flat and slightly higher than the metal member 24. Specifically, the lower surface of each of the grounding members 241 and 242 is higher than the lower side of the metal member 24 in the vertical direction by about several mm (millimeter).

[0048] <Grounding>

[0049] After the user performs a closing operation on the shielding portion 20, if the reading process of the document 100 of the ADF 22 set on the shielding portion 20 is started, Figure 2 (A) and Figure 2As shown in (B), the CIS 12 irradiates light 200 toward the original 100, and reads the image formed on the original 100 by receiving the reflected light. When the light 200 is irradiated from the CIS 12 toward the original 100, noise 300 is radiated from the CIS 12, but since the grounding is performed by the combination of the grounding member 141 and the grounding member 241 and the combination of the grounding member 142 and the grounding member 242 in a contact state, the radiation of the noise 300 can be suppressed.

[0050] Figure 3 (A) is a graph showing the magnitude of radiation noise of a conventional image reading device that is not provided with a grounding member. Figure 3 (B) is a graph showing the magnitude of radiation noise of the image reading device 1 according to the present embodiment.

[0051] exist Figure 3 The graph shown in (A) shows the maximum value 401 and the average value 402 of the radiation noise of the conventional image reading device without a grounding member, respectively, and the reference value 400 predetermined as the allowable radiation noise level. Figure 3 As shown in (A), the maximum value 401 and the average value 402 of the radiation noise of the conventional image reading device have no margins relative to the reference value 400, and there is a portion where the maximum value 401 of the radiation noise reaches the reference value 400.

[0052] exist Figure 3 The graph shown in (B) shows the maximum value 411 and the average value 412 of the radiation noise of the image reading device 1 according to the present embodiment, respectively, and a reference value 410 which is predetermined as the allowable radiation noise level. Figure 3 As shown in (B), the maximum value 411 and the average value 412 of the radiation noise of the image reading device 1 according to the present embodiment have a margin between each and the reference value 410. That is, the radiation noise from the CIS 12 can be suppressed.

[0053] <Other embodiments>

[0054] The present embodiment has been described above, but the present invention is not limited to the above-mentioned present embodiment. Furthermore, the effects based on the present invention are not limited to the effects described in the above-mentioned present embodiment. For example, Figure 1 and Figure 2 (A) and Figure 2 The structure of the image reading device 1 shown in (B) is merely an example for achieving the purpose of the present invention and is not particularly limited. As long as the image reading device 1 has the above-mentioned functions, it is not limited to which structure is used to achieve the function. Figure 1 and Figure 2 (A) and Figure 2The example shown in (B). And, Figure 3 The contents of the graph showing the magnitude of radiation noise shown in (B) are also just an example.

[0055] For example, in the above Figure 1 and Figure 2 (A) and Figure 2 In the example shown in (B), the heights of the grounding members respectively arranged in the main body 10 and the shielding member 20 of the image reading device 1 in the vertical direction are fixed, but the present invention is not limited thereto. For example, at least one of the grounding member arranged in the main body 10 and the grounding member arranged in the shielding member 20 may be configured to slide by the pressing force generated when in contact so that the height in the vertical direction can be changed. In this case, for example, a spring mechanism may be provided on at least one of the grounding member arranged in the main body 10 and the grounding member arranged in the shielding member 20 so that the grounding member moves up and down when in contact and when separated.

[0056] Furthermore, for example, the height of the grounding member disposed on the main body 10 in the vertical direction may not be uniform. That is, the heights of the grounding members 141 and 142 in the vertical direction may be different from each other. In this case, the height of the grounding members 241 and 242 corresponds to the height of the grounding members 141 and 142 in the vertical direction.

[0057] And, for example, in the above Figure 1 and Figure 2 In the example shown, two grounding members are disposed on the main body 10 and the shielding portion 20 , but the present invention is not limited thereto. For example, three or more grounding members may be disposed on the main body 10 and the shielding portion 20 .

[0058] (Note) (1)

[0060] An optical device, characterized in that it has:

[0061] a main body having a contact optical system type reading section disposed therein and having a document table glass and a first grounding member disposed on an upper surface thereof, wherein the contact optical system type reading section has an image sensor for reading light collected by a lens; and

[0062] The shield portion is provided with a second grounding member that contacts the first grounding member to be grounded by a closing operation of a user and is separated from the first grounding member to release the grounding by an opening operation of a user. (2)

[0064] The optical device according to (1), characterized in that

[0065] The combination of the first grounding member and the second grounding member in a contacting state by the closing operation is disposed near both ends of the reading unit. (3)

[0067] The optical device according to (2), characterized in that

[0068] The combination is respectively arranged outside both end portions of the reading portion. (4)

[0070] The optical device according to (2) or (3), characterized in that:

[0071] The combinations are respectively arranged near the edge of the document table glass. (5)

[0073] The optical device according to any one of (1) to (4), characterized in that:

[0074] The first grounding member and the second grounding member are formed of metal members having flat contact surfaces. (6)

[0076] The optical device according to (5), characterized in that

[0077] At least one of the first grounding member and the second grounding member that are in contact is capable of sliding due to a pressing force generated when in contact. (7)

[0079] The optical device according to any one of (1) to (6), characterized in that:

[0080] The shielding portion has an automatic document feeding function. (8)

[0082] The optical device according to (7), characterized in that

[0083] The shielding portion can automatically convey a document larger than A4 size.

[0084] According to the present invention (1), when the shielding portion is closed, the first grounding member and the second grounding member come into contact and are grounded. This makes it possible to suppress radiation noise from the reading portion without surrounding the entire device with a metal frame.

[0085] According to the present invention of (2), the combination of the first grounding member and the second grounding member in contact with each other by the closing operation is disposed near both ends of the reading section. This makes it possible to suppress radiation noise from the reading section.

[0086] According to the present invention of (3), the combination of the first ground member and the second ground member is respectively arranged outside the two end portions of the reading section. Thus, the combination of the first ground member and the second ground member surrounds the reading section. As a result, compared with the case where the combination of the first ground member and the second ground member does not surround the reading section, it is possible to efficiently suppress the radiation noise from the reading section.

[0087] According to the present invention of (4), the combination of the first grounding member and the second grounding member is respectively arranged near the edge of the original platen glass. Thus, the combination of the first grounding member and the second grounding member surrounds the reading section arranged inside the original platen glass. As a result, compared with the case where the combination of the first grounding member and the second grounding member does not surround the reading section, the radiation noise from the reading section can be suppressed more efficiently.

[0088] According to the present invention of (5), the first grounding member and the second grounding member are formed of metal members having flat contact surfaces, thereby reducing the risk of injury or damage to clothing even when the user's body contacts the grounding members while closing or opening the shielding portion.

[0089] According to the present invention of (6), at least one of the first and second grounding members in contact slides due to the pressing force generated when in contact. This allows the first and second grounding members to be in contact, thereby preventing contact failure.

[0090] According to the present invention of (7), since the shielding portion has the automatic document feeding function, the moving range of the reading portion is limited. Thus, the number of grounding members to be arranged can be limited.

[0091] According to the present invention of (8), the shielding unit can automatically convey a document larger than A4 size. Thus, it is possible to suppress radiated noise from the reading unit that can read a large document larger than A4 size by increasing the driving frequency.

[0092] The above-mentioned embodiments of the present invention are provided for the purpose of illustration and description. In addition, the embodiments of the present invention do not fully and exhaustively include the present invention, and do not limit the present invention to the disclosed methods. Obviously, various modifications and changes are self-evident to those skilled in the art to which the present invention belongs. The present embodiment is selected and described in order to most easily understand the principles of the present invention and its application. Thus, other technicians in the art can understand the present invention through various variations optimized for specific uses assumed to be various embodiments. The scope of the present invention is defined by the above claims and their equivalents.

Claims

1. An optical device, characterized in that: have: A main body having a contact optical system type reading section disposed therein and having a document table glass and a first grounding member disposed on an upper surface thereof, wherein the contact optical system type reading section has an image sensor for reading light collected by a lens; and The shield portion is provided with a second grounding member that contacts the first grounding member to be grounded by a closing operation of a user and is separated from the first grounding member to release the grounding by an opening operation of a user.

2. The optical device according to claim 1, characterized in that The combination of the first grounding member and the second grounding member in a contacting state by the closing operation is disposed near both ends of the reading unit.

3. The optical device according to claim 2, characterized in that The combination is respectively arranged outside both end portions of the reading portion.

4. The optical device according to claim 2 or 3, characterized in that: The combinations are respectively arranged near the edge of the document table glass.

5. The optical device according to any one of claims 1 to 4, characterized in that The first grounding member and the second grounding member are formed of metal members having flat contact surfaces.

6. The optical device according to claim 5, characterized in that At least one of the first grounding member and the second grounding member that are in contact is capable of sliding due to a pressing force generated when in contact.

7. The optical device according to any one of claims 1 to 6, characterized in that The shielding portion has an automatic document feeding function.

8. The optical device according to claim 7, characterized in that The shielding portion can automatically convey a document larger than A4 size.

Images