JPH0895169A - Image reader - Google Patents

Abstract

PURPOSE: To provide an image reader which is easily assembled and is miniaturized and in which power consumption and a manufacturing cost are reduced and whose exterior beauty is excellent. CONSTITUTION: A contact glass 7 is disposed to cover an opening part 1 at the upper surface of a nearly rectangular cylindrical main body frame 2, and a glass holding member 10 is engaged and arranged on the upper surface of the main body frame 2 so as to cover the peripheral edge part of the contact glass 7. Then, an outer cover 11 is engaged and mounted on the glass holding member 10 engaged and arranged at the upper surface of the main body frame 2 and the longitudinal direction parts of the main body frame 2 mutually confronting so that the upper piece 11A of the outside cover 11 is elastically held between an elastical holding piece 10a and a holding piece 10b, and locking pieces 11a-11d are locked in locking holes 4a-4d, and the locking pieces 13a-13c are locked in locking holes 3a-3c, and the image of the original on the contact glass 7 is optically read by a carriage.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image reading device for reading a document image.

[0002]

2. Description of the Related Art An image reading apparatus is attached to an image forming apparatus such as a copying machine and has a contact glass and a carriage. It has a function of optically reading an image of an original document placed on the contact glass by the carriage. Have

FIG. 6 is an exploded perspective view showing the structure of the main part of a conventional small-sized image reading apparatus. In the conventional small-sized (about A4 size) image reading apparatus, the contact glass 21 is
It is reinforced with a reinforcing plate 22, and is bonded to the main body frame 20 with, for example, a double-sided tape so as to cover the opening 20a formed in the main body frame 20.

FIG. 7 is a cross-sectional explanatory view showing the structure of a main part of a conventional general image reading apparatus.
The end portion of is fixed to the main body frame 20A with screws 24 via the glass pressing member 23, and the exterior cover 26 is fixed to the main body frame 20A with screws 25. In the main body frame 20A, a carriage 27 that irradiates a document placed on the contact glass 21 with light and obtains an optical signal corresponding to the image of the document is movably arranged along a guide rail 28. There is.

[0005]

In the above-mentioned general image reading apparatus, the distance δ between the contact glass 21 and the carriage 27 cannot be shortened too much due to the presence of the screws 24 and 25. If this distance δ becomes long, a highly accurate optical signal corresponding to the original image cannot be obtained unless the amount of light applied to the original is increased. Increasing the amount of light irradiating the document increases the size of the carriage 27, the size of the entire device, and the power consumption of the device.

Therefore, in this type of image reading apparatus,
It is necessary to shorten the distance δ between the contact glass 21 and the carriage 27. To this end, the screws 24, 2
It is conceivable that the position of 5 is out of the moving range of the carriage 27, but in this case, the contact glass 21
Becomes large, the device becomes large, and the manufacturing cost also increases. Further, there is a problem that abnormal images are formed due to the deflection of the contact glass 21 when the document is pressed, and the presence of the screw impairs the exterior appearance.

The present invention has been made in view of the current state of the image reading apparatus of this kind as described above, and its purpose is to:
An object of the present invention is to provide an image reading apparatus which is easy to assemble, has a small size as a whole, can reduce power consumption and manufacturing cost, and has excellent exterior appearance.

[0009]

In order to achieve the above object, the invention according to claim 1 is characterized in that a contact glass is arranged on the upper surface, and an original arranged on the contact glass is scanned with light by a carriage. Then, in the image reading device that optically reads the original image by obtaining the optical signal corresponding to the original image, the contact glass is formed in a substantially rectangular tube shape and covers the opening on the upper surface. A main body frame, a glass pressing member which covers the peripheral portion of the contact glass and is engaged with the upper surface of the main body frame, and a concave-convex engagement between the glass pressing member and the main body frame. A concave-convex engaging portion, the concave-convex engaging portion engages with the glass pressing member engaged with the upper surface of the main body frame, and the longitudinal portions of the main body frame facing each other. It is characterized in that it has a Rugaiso cover.

Similarly, in order to achieve the above object, the invention according to claim 2 is different from the invention according to claim 1 in that it is provided on the upper surface of the main body frame and positions the contact glass on the upper surface. The present invention is characterized in that a positioning section for carrying out is further provided.

Similarly, in order to achieve the above object, the invention according to claim 3 is different from the invention according to claim 1 in that it is attached to the main body frame so as to face one end in the longitudinal direction of the exterior cover. The end cover and the exterior cover,
Attachment means for attaching to the end cover so as to exert an elastic force is further provided.

[0012]

According to the first aspect of the present invention, the contact glass is arranged so as to cover the opening on the upper surface of the main body frame having a substantially rectangular parallelepiped shape, and the glass pressing member is provided on the upper surface of the main body frame so that the peripheral edge portion of the contact glass is provided. Is engaged and connected to cover the.
Then, the exterior cover is engaged with the glass pressing member disposed on the upper surface of the main body frame and the longitudinal portions of the main body frame facing each other by the concave-convex engaging portions so that the outer cover can be moved by the carriage. 2. Description of the Related Art An image reading apparatus is assembled that optically scans a document on a contact glass, obtains an optical signal corresponding to the document image, and optically reads the document image.

According to the second aspect of the invention, in addition to the operation of the first aspect of the invention, the positioning portion provided on the upper surface of the main body frame positions the contact glass on the upper surface of the main body frame. .

According to the invention of claim 3, in addition to the operation of the invention of claim 1, the end cover is attached to the main body frame so as to face one end of the exterior cover in the longitudinal direction, and the exterior cover is attached. It is attached to the end cover by an elastic force.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is an exploded perspective view showing the configuration of one embodiment of the present embodiment, FIG. 2 is an explanatory sectional view showing an assembled state of the present embodiment, FIG. 3 is an explanatory view of positioning of a contact glass of the present embodiment, and FIG. Is an explanatory view of the assembling of the outer cover and the end cover of the present embodiment, and FIG. 5 is an explanatory view of the assembling of the glass pressing member and the outer cover of the present embodiment.

In this embodiment, as shown in FIG. 1, main body frames 2 each having a rectangular parallelepiped shape and having an opening 1 on the upper surface thereof are provided. The engaging holes 3a to 3 are formed in the facing side edges, respectively.
c is formed, locking holes 5a and 5b are formed at side edges of the opening 1 of the main body frame 2 in the longitudinal direction, respectively, and engaging holes are formed on circumferential surfaces of the main body frame 2 which face each other in the longitudinal direction. Stop holes 4a to 4d are formed. Also, FIG.
As shown in FIG. 3, stoppers 8 having stopper surfaces 8 a and 8 b for the end surface and the peripheral surface of the contact glass 7 are provided on the peripheral edge portion near one end of the opening 1 of the main body frame 2. A glass receiver 9 is provided in the vicinity. Then, the contact glass 7 is arranged on the upper surface of the main body frame 2 so as to be positioned by the stopper 8 and contact the glass receiving portion 9 so as to cover the opening 1.

On the other hand, a plurality of elastic holding pieces 10 which are parallel to each other
a and a holding piece 10b arranged opposite to these elastic holding pieces 10a, and a glass holding member 10 provided with an inserting piece 10c protruding substantially at a right angle to the holding piece 10b. The member 10 is the insertion bar 10c.
Are locked in the locking holes 5a, 5b to cover the peripheral edges of the contact glass 7 that face each other in the longitudinal direction, and the contact glass 7 is pressed and fixed to the upper surface of the main body frame 2. Arrangement lines corresponding to the size of the transfer paper of the original arranged on the contact glass 7 are printed on the glass pressing member 10.

Further, the locking pieces 11a-11 have a U-shaped cross section.
d and the exterior cover 11 including the locking pieces 13a to 13c
However, the locking pieces 11a to 11d are locked in the locking holes 4a to 4d, respectively.
, And the locking pieces 13a to 13c are respectively locked in the locking holes 3
It is engaged with and attached to both circumferential surfaces in the longitudinal direction of the main body frame 2 to which the glass pressing member 10 is attached by being locked to a to 3c. In this engaged and mounted state, the upper piece 11A of the outer cover 11 has the elastic sandwiching piece 10a and the sandwiching piece 10b.
Elastically inserted between the outer cover 11 and the outer cover 11, the glass pressing member 10 is stably fixed to the main body frame 2.

Further, an end cover 12 having a U-shaped cross section is screwed and fixed to one end face in the longitudinal direction of the body frame 2, and the exterior cover 11 is attached to the other end face side in the longitudinal direction of the body frame 2. 2 is screwed and fixed, and by this screwing, as shown in FIG.
A force is applied to the end cover 1 in a direction of contacting the end cover 12, and the end cover 12 and the exterior cover cover the main body frame 2 with almost no gap between them.

As described above, in this embodiment, the contact glass 7 is accurately positioned and arranged on the main body frame 2,
By engaging the glass pressing member 10 with the main body frame 2,
Both side edges in the longitudinal direction of the contact glass 7 are fixed to the main body frame 2, and the exterior cover 11 is engaged and attached to the longitudinal direction portion of the main body frame 2. With this exterior cover, the glass pressing member 10 is attached to the main body frame 2. A screw that stably fixes the contact glass 7 to the main body frame 2 with high precision and covers the main body frame 2 with the outer cover 11 and the end cover 12 so that the image reading device can easily and easily project into the main body frame 2. Firmly assembled without any parts.

As described above, according to the present embodiment, it is possible to easily assemble, and since there is no screw member projecting into the main body frame 2, the distance between the carriage 27 and the contact glass 7 is shortened, so that the apparatus can be made compact. Enable
It is possible to reduce the gap between the outer cover 11 and the end cover 12 and enhance the appearance.

FIG. 5 is an explanatory view showing another example of the assembling of the glass pressing member and the outer cover of this embodiment.
Then, the engaging piece 10m of the glass pressing member 10M is adapted to engage with the concave portion 11m provided in the exterior cover 11M. Further, in FIG. 7B, the engagement piece 10m of the glass pressing member 10M similar to that in FIG.
The ribs 11n are provided so as to face each other. Further, in FIG. 3C, an engagement hole 10n is formed in the glass pressing member 10N, and the exterior cover 1 is provided in the engagement hole 10n.
An engagement piece 11p provided so as to project from the facing surface of 1P is engaged.

[0023]

According to the first aspect of the present invention, the contact glass is arranged so as to cover the upper open surface of the main body frame having a substantially rectangular parallelepiped shape, and the glass pressing member is provided on the upper surface of the main body frame. Engagement and connection covering the peripheral edge,
The outer cover is engaged with the glass pressing member arranged on the upper surface of the main body frame and the peripheral surfaces of the main body frame facing each other at their respective concave-convex engaging portions, and a connecting member protruding into the main body frame is provided. Since it does not exist, it can be easily assembled, and the distance between the carriage and the contact glass can be shortened, so that the device can be downsized and the appearance can be improved. According to the invention of claim 2, in addition to the effect obtained by the invention of claim 1, the positioning portion provided on the upper surface of the main body frame positions the contact glass on the upper surface of the main body frame. Further, the assemblability is improved. According to the invention of claim 3, in addition to the effect obtained by the invention of claim 1, the end cover is attached to the main body frame so as to face one end in the longitudinal direction of the exterior cover, and the exterior cover comprises: Since the mounting means is mounted so as to exert an elastic force on the end cover, it is possible to reduce the gap and further enhance the appearance.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing the configuration of an embodiment of the present invention.

FIG. 2 is a sectional explanatory view showing an assembled state of the same embodiment.

FIG. 3 is an explanatory diagram of positioning of the contact glass according to the embodiment.

FIG. 4 is an explanatory view of the assembling of the exterior cover and the end cover of the embodiment.

FIG. 5 is an explanatory view showing another example of the assembling of the glass pressing member and the exterior cover of the same embodiment.

FIG. 6 is an exploded perspective view showing a configuration of a main part of a conventional small-sized image reading device.

FIG. 7 is a cross-sectional explanatory view showing a configuration of a main part of a conventional general image reading apparatus.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Opening part 2 Main body frame 3a-3c Locking hole 4a-4d Locking hole 10 Glass holding member 11 Exterior cover 11A Upper piece 11a-11d Locking piece 12 End cover 13a-13c Locking piece

Claims (3)

[Claims] 1. A contact glass is arranged on the upper surface, and a carriage scans a manuscript placed on the contact glass with light to obtain an optical signal corresponding to the manuscript image, thereby optically scanning the manuscript image. In the image reading apparatus for reading the main body frame, which is formed in a substantially rectangular parallelepiped shape and covers the opening on the upper surface, and in which the contact glass is disposed, and the peripheral edge portion of the contact glass, A glass pressing member disposed so as to engage with the upper surface, and a concave-convex engaging portion between the glass pressing member and the main body frame, and the concave-convex engaging portion engages and disposes on the upper surface of the main body frame. An image reading apparatus comprising: the glass pressing member that is formed; and an exterior cover that is engaged with longitudinal portions of the body frame that face each other. 2. The image reading apparatus according to claim 1, further comprising a positioning portion which is provided on an upper surface of the main body frame and which positions the contact glass on the upper surface. 3. An end cover attached to the main body frame so as to face one end in the longitudinal direction of the exterior cover, and an attachment means for attaching the exterior cover so as to exert an elastic force on the end cover. The image reading apparatus according to claim 1, further comprising: