JPH04196868A - Original reader and information processor using same - Google Patents

Abstract

PURPOSE:To improve this reader and processor so that the complicated pint adjusting process of a short focus image forming element array (SLA) by holding an elastic member between a first recessed part and a second recessed part, adhering the SLA and a holding member to constitute the device. CONSTITUTION:The first recessed part is provided on substantially a half part of the optical axis direction of an SLA 1 in the flank of the SLA 1 and the second recessed part is provided on substantially a half part of the distance between an original reference face and an optical sensor 4 in a holding member. An elastic member 3 is held between the first recessed part and the second recessed part, the SLA 1 and the holding member are adhered and the device is constituted. The adjusting of the SLA can be executed automatically by assembling the device so as to hold the elastic member 3 with adhering between the first recessed part provided on the flank of the SLA 1 and the second recessed part provided on the holding member of a casing body 2 in such a manner. Thus, the complicated pint adjusting of the SLA 1 is eliminated and assembling can be completed without actuating the sensor.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a document reading device using a short-focus imaging element array and an information processing apparatus using the same, and particularly to a method for positioning the short-focus imaging element array. The present invention relates to an improved document reading device and an information processing device using the same.

[Prior Art] FIG. 5 is a cross-sectional view (A) of a document reading device using a conventional short-focus imaging element array, and a front view (A) showing the internal structure.
B), and the figure (A) shows the YY' cross section of the figure (B).

In the figure, 1 is a short focus imaging element array (hereinafter referred to as SLA).
2 is a housing, 5 is a cover glass, 4 is an optical sensor, 6 is an SLA fixing screw, 7 is an adjustment screw for positioning the SLA for focus adjustment, and f is the document surface.

Conventionally, the method for positioning 5LAI in a document reading device having such a configuration is to adjust the position of 5LAI using the focus adjustment screw 7 as shown in Fig. 3.
up and down, place an MTF chart with black and white lines arranged according to the resolution of the optical sensor closely on the document surface f, and while looking at the waveform with an oscilloscope, find the highest MTF, which is the difference between the output signal according to white and black. This was done by adjusting it to the desired value and fixing it with the SLA fixing screw 6.

Also, by replacing the focus adjustment screw 7 with an adjustment jig,
A method of increasing and decreasing 5LAI was also used.

[Problems to be Solved by the Invention] However, in the above conventional example, the variation in the thickness H of the SLA is, for example, ±0.33 mm, and the TC value (optical distance between the sensor surface and the document surface) is 14.4 mm. At some point, I had to position the center of SLA at 1/2 of the TC value for focus adjustment, and the HTC value was ±0.1mm.
(Secure MFT=40%) accuracy is required. Therefore, the following points should be improved.

(1) *A complicated SLA focus adjustment process is required.

(2) It is necessary to operate the sensor and adjust the waveform by reading the chart.

(3) A focus adjustment screw or focus adjustment jig is required.

(4) Dust may be generated by the focus adjustment screw and the SLA fixing screw.

(5) SLA fixing screws may cause cracks in the SLA.

[Means for Solving the Problems] The present invention provides, as means for solving the above-mentioned problems, an optical sensor, a short focus imaging element array, a holding member that holds the short focus imaging element array, In the document reading device, which integrally includes a document reference surface that contacts the document and a document positioning member for determining the position of the document with respect to the optical sensor, the side surface of the short focus imaging element array includes the A first lens is provided in substantially one half of the short focus imaging element array in the optical axis direction.
A recessed portion is provided in the holding member, and a second recessed portion is provided in a portion substantially half the distance between the original document reference surface and the optical sensor; There is provided a document reading device characterized in that the short focus imaging element array and the holding member are configured to be in close contact with each other by sandwiching an elastic member between the recess and the second recess. be.

The present invention also provides an information processing apparatus comprising the document reading device and holding means for holding the document at a reading position.

[Operation] According to the present invention, the short focus imaging element array (SLA)
By assembling the elastic member so that it is held in close contact between the first recess provided on the side surface of the case and the second recess provided in the holding member of the housing, the SLA can be automatically adjusted. can. Therefore, unlike conventional methods, the distance T between the sensor surface and the document surface can be adjusted without adjusting the SLA by slightly moving it up and down.
The center of the SLA can be secured at A (center position) of C.

[Example] Hereinafter, an example of the present invention will be described with reference to the drawings.

FIG. 1 is a diagram showing an embodiment of a document reading device according to the present invention, and FIG. 1 CB) is a schematic front sectional view of the embodiment;
<A) is an xx' cross-sectional view of fB), and in the figure,
1 is a short focus imaging element array (SLA), 2 is a housing, 3 is a cylindrical rubber string as an elastic member, 4 is an optical sensor, 5
is the cover glass, and f is the document surface.

Further, FIG. 2 is a sectional view of the document reading device showing the assembly method of this embodiment, and FIG. 3 is a perspective view of 5LAI of this embodiment.
FIG. 4 shows details of the cross-sectional shape of the housing.

In this example, a 5LAI with an optical distance T C = 14.4+nm for imaging the original on the sensor 4 is used, its thickness H = 6.8 mm, and the position of the square groove is h = 3.4 m at the center of H.
m, j2 = 1 mm, w = 0.5 mm, the material of the rubber string 3 used this time is silicone, and the rubber hardness is 50° or less. The diameter of the elastic rubber string 3 is assumed to be D=1 mm. In addition, the position of the groove for fixing the rubber string in the housing 2 is set to TC/2 = 7.2 mm at the center of the TC, the depth of the groove is set to t = 0.3 mm, and the angle θ = 120°.

With the above dimensions, insert the rubber string 3 into the 5LAI from the Y direction as shown in Figure 2, and lock the 5LAI with the rubber string 3 inserted into the ■groove of the housing 2 from two directions. Insert it until it appears.

The above operations complete focus adjustment and assembly.

In the above-mentioned embodiment, the 7-shaped groove is a concave part on the housing side, and the SL
Although the recesses on the A side are square grooves, the shape of the grooves may be reversed, or both grooves may be V-shaped grooves.

Further, as the elastic member 3 for positioning and fixing, an elastic plate spring or the like may be used instead of the rubber mentioned in the embodiment.

In addition, as the optical sensor 4, a long optical sensor using amorphous silicon as described in U.S. Patent No. 4,461,956 issued to Hata et al. , is preferable because of its high resolution.

Also, U.S. Patent No. 4.79 granted to inventor Himi et al.
No. 1,469 and U.S. Pat. No. 4,810,896 issued to inventor Tanaka et al., a capacitive load is provided on the emitter of a bipolar transistor, and the output signal is changed from the emitter to a voltage. A readout type optical sensor is also more preferably used.

FIG. 6 is a schematic configuration diagram showing an example of a facsimile having a communication function as an image information processing device configured using the document reading device (sensor unit 100) according to the present embodiment.

Here, 102 is a feeding roller serving as a feeding means for feeding the original pp toward the reading position, and 104 is a separation piece for reliably separating and feeding the original pp one by one. A platen roller 106 is provided at a reading position with respect to the sensor unit 100 and serves as a conveying means for regulating the surface to be read of the document pp and conveying the document pp.

In the illustrated example, P is a recording medium in the form of a roll paper,
In the case of image information read by the sensor unit 100 or a facsimile device, image information transmitted from the outside is reproduced here. Reference numeral 110 denotes a recording head as a recording means for forming the image, and various types such as a thermal head and an inkjet recording head can be used. Further, this recording head may be of a serial type or a line type.

Reference numeral 112 denotes a platen roller serving as a conveying means for conveying the recording medium P to the recording position by the recording head 110 and regulating the recording surface thereof.

Reference numeral 120 denotes an operation panel on which are arranged switches and messages for receiving operation input as input/output means, and a display section for notifying the status of the apparatus.

Reference numeral 130 denotes a system control board as a control means, and is provided with a control section (controller) for controlling each section, a drive circuit (driver) for the photoelectric conversion element, an image information processing section (processor), a transmitting/receiving section, and the like. 1
40 is a power source for the device.

As the recording means used in the information processing device of the present invention,
For example, U.S. Pat. No. 4,723,129, U.S. Pat.
Preferably, the typical configuration and principle thereof are disclosed in the specification of No. 0796. In this method, at least one electrothermal transducer that corresponds to the recorded information and that causes a rapid temperature rise exceeding nucleate boiling is applied to an electrothermal transducer placed corresponding to the sheet holding the liquid (ink) or the liquid path. By applying a drive signal, the electrothermal transducer generates thermal energy, causing film boiling on the heat-active surface of the recording head, resulting in bubbles in the liquid (ink) corresponding one-to-one to this drive signal. It is effective because it forms 8. The growth of this bubble,
The contraction causes liquid (ink) to be ejected through the ejection opening to form at least one drop.

Furthermore, as a full-line type recording head having a length corresponding to the width of the maximum recording medium that can be recorded by the recording device, a combination of multiple recording heads as disclosed in the above-mentioned specification can be used. Either a configuration that satisfies the length or a configuration as a single recording head integrally formed may be used.

In addition, a replaceable chip-type recording head that is attached to the device body enables electrical connection to the device body and ink supply from the device body, or an ink tank in the recording head itself. The present invention is also effective when using a cartridge type recording head in which a recording head is integrally provided.

[Effects of the Invention] The present invention eliminates the need for complicated SLA focus adjustment, so the following effects can be obtained.

(1) Assembly can be completed without activating the sensor.

(2) No need for focus adjustment jigs or fixing screws.

(3) There is no need for a focus adjustment jig or setting process for fixing screws.

(4) It is possible to eliminate the generation of dust and cracks in the SLA due to fixing screws.

As mentioned above, manufacturing processes and parts are eliminated, and SLA adjustment is no longer required, resulting in shorter manufacturing times, lower manufacturing costs, and improved product quality and product yield. It will be done.

Further, even if deformation occurs due to the difference in thermal expansion coefficient between the casing and the SLA, the deformation is absorbed by the elastic member, so that the reference plane can be stably maintained.

[Brief explanation of the drawing]

In FIG. 1, (B) is a schematic front cross-sectional view of a document reading device embodying the present invention, and (A) is a cross-sectional view taken along the line X-X° of (B). FIG. 2 is a cross-sectional view showing a method of assembling a short focus imaging element array according to the present invention. FIG. 3 is a perspective view of a short focus imaging element array implementing the present invention. FIG. 4 is a cross-sectional view showing details of a V-shaped groove on the housing side in which the present invention is implemented. FIG. 5(A) is a side sectional view showing the internal structure of a document reading device using a conventional focus adjustment screw, and FIG. 5(B) is a front sectional view. FIG. 6 is a schematic structural diagram of a facsimile machine as an information processing equipment using the document reading device of the present invention. 1 is a short focus imaging element array (SLA), 2 is a housing, 3 is an elastic member (rubber string), 4 is an optical sensor, 5 is a cover glass, 6 is an SLA fixing screw, 7 is a focus adjustment screw (1/2TC) Adjustment screw) 8...The leaf spring is the cutting dimension of the SLA, f is the document surface (document reference surface), H is the thickness of the SLA, TC is the distance between the document surface and the sensor, 1/2. T C...Distance between SLA center and document surface and sensor D...Rubber string diameter Y...Direction when assembling the rubber string 2...Direction when assembling SLA h...SLA Center of the square groove i...Radius of the square groove W...Depth of the square groove t...Depth of the V-shaped groove θ...Angle of the V-shaped groove Agent Patent Attorney Seki Taira Yamashita Foil Figure 1 (A) Figure 1 (B)

Claims (5)

[Claims] (1) It has an optical sensor, a short-focus imaging element array, a holding member that holds the short-focus imaging element array, and an original reference surface that contacts the original, and determines the position of the original with respect to the optical sensor. In the document reading device that integrally has a document positioning member for the purpose of 1st
a recessed portion is provided in the holding member, a second recessed portion is provided in a portion substantially half of the optical distance between the document reference surface and the optical sensor; An original reading device characterized in that the short focus imaging element array and the holding member are configured to be in close contact with each other by sandwiching an elastic member between the concave portion and the second concave portion. (2) The document reading device according to claim 1, wherein at least one of the first recess and the second recess has a V-shaped groove structure having an angle of 90 degrees or more. (3) The document reading device according to claim 1, wherein the elastic member is made of rubber. (4) The document reading device according to claim 1, wherein the elastic member is a plate spring. (5) An information processing apparatus comprising the document reading device according to claim (1) and holding means for holding the document at a reading position.