JPH03217164A - Original reader - Google Patents

Abstract

PURPOSE:To obtain read data with high quality by integrally forming and constituting the mechanism and function part of an original reader in a lower case. CONSTITUTION:On the both sides of a lower case 1, a sliding surface 1a of a sliding chip 10 fixed to the bottom of an optical head 5 and receiving surfaces 1b and 1c of original platen glass 4 are arranged and the above mentioned receiving surface 1b and the other receiving surface 1c are integrally formed while constituting a receiving surface 1d of an upper case 2. The above mentioned upper case 2 fixes the above mentioned original platen glass 4 and fixes it to the above mentioned receiving surface 1d by a screw 14 so as to internally provide the mechanism part of the reader. Projection parts 1e and 1f to regulate the moving direction of the above mentioned optical head 5 are formed at the part of the above mentioned lower case 1 positioning at the near center of the above mentioned optical head 5 on the both sides of the moving means of the above mentioned optical head 5.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to the configuration of an optical head moving type document reading device.

-2- [Prior art] An optical head moving type document reading device for reading documents such as text and photographs is generally known as a flatbed type. In this case, the most commonly known optical head movement structure is a timing belt drive system using a step motor.

FIG. 7 is a plan view showing the main parts of the structure of a conventional document reading device. In FIG. It is pivotally supported so as to be movable in the direction of arrow A. The other end of the optical head 25 is slidably supported by the slide rail 22. Further, a timing belt 29 is disposed near the bearing 25a of the optical head 25, and one side of the timing belt 29 is locked with one end of the optical head 25. The timing belt 29 is driven in the direction of arrow A by a control signal (not shown), and the optical head 25 performs a reading operation.

[Problems to be Solved by the Invention] However, in conventional document reading devices, as shown in Figure 7, it is very important to manage the clearance between the pivot and the bearing, and furthermore, the optical head Since the optical head is moved using a pivot fixed at a position apart from the center as a guide, it is difficult to balance the forces when moving the optical head, and the optical head slightly vibrates in the direction of arrow C during reading operation. There was a risk. This has been a major issue in recent years, where there is a trend toward higher resolution.

In addition, since the number of component parts is large, it is extremely difficult to respond to cost reductions, resulting in disadvantages for both producers and consumers.

In order to solve these conventional problems, the present invention organically integrates many functions into the lower case, thereby preventing the optical head from vibrating during reading by the reading device. It is an object of the present invention to provide a document reading device that has a very small number of parts and is easy to assemble.

-4- [Means for solving the problem] In order to solve the above problem, a method is provided for illuminating a document to be read, forming an image of the document on a photoelectric conversion element, and obtaining an output corresponding to the image. an optical head, a document table glass on which a document to be read is set, means for moving the optical head along the document to be read, an upper case to which the document table glass is fixed, a sliding surface of the optical head, and the document. and a lower case having a receiving surface for a base glass, a means for moving the optical head is located approximately in the center of the optical head and disposed in the lower case, and a means for regulating the direction of movement of the optical head. is located approximately in the center of the optical head and disposed in the lower case, and includes means for engaging with the lower case on both sides of one end of the upper case, and a receiving surface of the upper case is attached to the lower case. A plurality of protrusions are provided on the receiving surface of the upper case, and a screw pilot hole is provided in the protrusions.

[Function] According to the document reading device of the present invention configured as described above, even if the resolution of the reading device is improved -5-, it can be easily coped with, and the cost reduction of the reading device can be easily coped with. It is possible.

[Example] Examples of the present invention will be described below based on the drawings. 1st
The figure is a plan view of essential parts showing the configuration of the document reading device of the present invention. In FIG.・The IC is arranged on both sides of the lower case 1, and the above-mentioned receiving surface 1
b and the other receiving surface IC are integrally molded while forming the receiving surface 1d of the upper case 2. The upper case 2 fixes the document table glass 4 and is fixed to the receiving surface 1d with screws 14 so as to contain the mechanical part of the reading device. Projections 1e and 1f for regulating the moving direction of the optical head 5 are formed on both sides of the moving means for the optical head 5 and at a portion of the lower case 1 located approximately at the center of the optical head 5. . The details will be described later, but a pair of rollers 6 and 7 rotatably held by the optical head 5 are used as guides for the projections 1e and 1f, and a control drive signal (not shown) is used to drive the rollers. The optical head 5 is moved in the direction of arrow X to perform a document reading operation.

FIG. 2 is a cross-sectional view showing the configuration of the optical head moving means.
FIG. 2 is a cross-sectional view of a main part of FIG. 1 viewed from R; In FIG. 2, moving means for the optical head 5 is disposed between the protrusion 1e and the protrusion 1f. First, a driving gear 15 equipped with a timing gear 15a is arranged on one side of the lower case 1, and a driven gear 16 is arranged on the other side, and a timing belt 17 is disposed in mesh with both gears. 16 is held in the lower case 1 by brackets 15c and 16c so as to be rotatable about shafts 15b and 16b. The motor 18 is fixed to the lower case 1 with screws 19 so that the drive gear 15 and the pinion 18a fixed to the drive shaft mesh with each other. Any part of the timing belt 17 configured in this way is locked by a belt clamper 9 fixed to the bottom of the optical head 5, and the motor 18 is controlled by a control drive signal (not shown).
is driven to move the optical head 5 in the direction of arrow X while slidingly moving the sliding surface 1a with the sliding chip 10 fixed to the bottom of the optical head 5, thereby performing a reading operation. This is what we do.

FIG. 3 is a sectional view of a main part taken from P in FIG. 1.

In FIG. 3, the upper case 2 to which the original platen glass 4 is fixed is attached to the receiving surface 1b/IC of the original platen glass 4 arranged on both sides of the lower case 1.
is held and fixed. In this way, the original 1 to be read
The original platen glass 4, which is the reference surface of No. 2, is placed on the receiving surface 1b.
1c, and by moving the optical head 5 while sliding on the sliding surface 1a with the sliding chip 10 fixed to the bottom of the optical head 5, the original 12 to be read with the optical head 5 is moved. Since it is possible to always maintain equal intervals, that is, a parallel state, a higher quality image signal can be obtained.

Further, a lower case 1 located approximately in the center of the optical head 5
The protruding portion 1e disposed at a portion of the optical head 5
A roller 6 is rotatably held on a shaft 5a provided at the
It is the rolling surface of Then, a plate panel 8 having elasticity for constantly pressing the roller 6 against the protrusion 1e,
The protrusion 1f constitutes the rolling surface of the roller rough held in a freely rotatable manner. Further, a belt clamper 9 fixed to the bottom of the optical head 5 and a timing belt 17 are engaged. With this configuration, the direction of movement of the optical head 5 can be regulated with high precision by the pinching force between the rollers 6 and 7, using the projection 1e as a reference plane.

FIG. 4 is a cross-sectional view of the main part of the upper case 2 in the Q view of FIG. 1.
It is a figure which shows one fixing means of. In FIG. 4, fixing claws 8 that engage with the bottom part 1j of the receiving surface 1b of the document table glass 4 disposed in the lower case 1 are provided on both sides of the upper case 2 with a predetermined elasticity in the direction of arrow E. It is molded integrally with the upper case 2. The fixing claw 8 is attached to the bottom 1 of the receiving surface.
j, the original table glass 4 is placed on the receiving surface 1b by its own elasticity, and the upper case 2 and the bottom part 1j of the receiving surface are sandwiched and engaged integrally. are doing. Although FIG. 5 shows the engagement structure for only one side of the upper case, it goes without saying that the other side is constructed in the same way.

FIG. 5 is a sectional view of a main part showing a method of assembling the upper case shown in FIG. 4. In FIG. 5, when assembling the upper case 2 to the lower case 1, it is not assembled from directly above. The fixing claw 8 and the original glass receiving surface 1b
・To the extent that it does not interfere with the end face of the IC, that is, the distance A in the diagram
Move the upper case 2 in the direction of arrow B so that the distance is approximately 1 mm or more.
After shifting in the direction and setting, by sliding the upper case 2 in the direction of arrow D, the fixing claw 8 is structured to engage with the bottom part 1j of the receiving surface while maintaining its elasticity. The upper case 2 and the lower case 1 together constitute a housing of the reading device. Note that the upper case 2 can be easily removed by performing the reverse process described above.

Although one fixing means of the upper case has been explained with reference to FIGS. 4 and 5, the other fixing means of the upper case is shown in FIG. FIG. 6 is a sectional view of a main part of the S view of FIG. 1, showing the other fixing means of the upper case.

-10- In FIG. 6, the receiving surface 1d of the upper case 2 is formed by integrally molding the receiving surface 1b of the document platen glass 4 and the other receiving surface IC on the lower case 1. A protrusion 1g is provided, and the protrusion 1g is provided with a screw hole 1h for fastening. The guide hole 2a provided in the upper case 2 and the protrusion 1g are fitted, and the upper case 2 is fastened to the receiving surface 1d with the screw 14 while determining the positions of the upper case 2 and the lower case 1.・Fixed. In this way, the upper case 2 and the lower case 1 are integrally fastened and combined with the document table glass 4 sandwiched therebetween.

In this way, the approximate center of the optical head, which is the part where the balance of forces is best when moving the optical head, is locked to a part of the timing belt, so that the optical head can be moved. The projections 1e and 1f and the moving means are arranged in the lower case 1.

In the embodiments described above, since the optical head moving means can be disposed approximately at the center of the optical head, furthermore,
-11- Since the optical head can be moved at approximately the center of the optical head, a stable movement pattern of the optical head can be obtained, and since the document and the optical head can always be kept parallel, high quality can be achieved. This works effectively to obtain read data.

Further, by configuring each receiving surface integrally with the lower case, it is effective to reduce the number of component parts of the reading device.

[Effects of the Invention] As explained above, according to the configuration of the present invention, high-quality read data can be obtained by organically molding and configuring the mechanisms and functional parts of the document reading device in the lower case. Furthermore, there is an effect that the cost of the reading device can be reduced.

[Brief explanation of drawings]

FIG. 1 is a plan view of a main part showing the configuration of a document reading device according to the present invention, FIG. 2 is a sectional view of the main part shown in R of FIG. FIG. 1 is a cross-sectional view of the main part in the P view, FIG. 4 is a view showing one of the fixing means of the upper case, and a cross-sectional view of the main part in the Q view of FIG. 12- A cross-sectional view of the main parts showing the mounting method, FIG. 6 is a view showing the other fixing means of the upper case, and a cross-sectional view of the main parts from the S view of FIG. 1. FIG. 7 is a cross-sectional view of the main parts of the conventional document reading device. FIG. 3 is a plan view showing main parts of the configuration. 1 ...Lower case 2 ...Upper case 4 ...Original glass 5 ...Optical head 6 ...Roller 7 ...Roller 8 ... ... Fixed claw 9 ... Belt clamper 10 ... Sliding tip 12 ... Original 14 ... Screw 15 ... Drive gear 16 ... Driven Gear 17... Timing belt 18... Motor

Claims (7)

[Claims] (1) An optical head for illuminating a document to be read, forming an image of the document on a photoelectric conversion element, and obtaining an output according to the image, and a document table glass for setting the document to be read;
The apparatus comprises means for moving the optical head along the document to be read, an upper case to which the document glass is fixed, and a lower case having a sliding surface for the optical head and a receiving surface for the document glass. A document reading device characterized by: (2) The document reading device according to item 1, wherein means for moving the optical head is located approximately at the center of the optical head and is disposed in the lower case. (3) The document reading device according to item 1, wherein means for regulating the moving direction of the optical head is located approximately at the center of the optical head and is disposed in the lower case. (4) The document reading device according to item 1, further comprising means for engaging with the lower case on both sides of one end of the upper case. (5) The document reading device according to item 1, wherein the lower case has a receiving surface for the upper case. (6) The document reading device according to item 1, wherein the receiving surface according to item 5 is provided with a plurality of protrusions. (7) The document reading device according to item 1, wherein the protrusion described in item 6 is provided with a pre-screw hole.