JPS60240266A - Optical image reader - Google Patents

Abstract

PURPOSE:To read three-dimensional information such as scenery by changing the optical path length between an image forming lens and a one-dimensional solid-state image pickup element. CONSTITUTION:In reading scenery, the reader is brought into the scenery reading specifications. Then a pulse motor 34 is actuated at first, a ball screw 38 is driven and then a one-dimensional solid-state image pickup element 18 is changed and it is brought to a position just after the focus of the image forming lens 16. Thus, the image of the scenery at a distance sufficiently apart from the image forming lens 16 is formed on a face including a photodetection section of the one-dimensional solid-state image pickup element 18. Thus, not only an original but also scenery such as a picture on a black-board and screen is read.

Description

[Detailed description of the invention] (Technical field) The present invention relates to an optical image reading device.

(Prior art) A document placed flat on a document placement glass is scanned,
2. Description of the Related Art A document reading device that uses an imaging lens to form an image of a source from a scanned portion onto a pickup plate and converts it into an electrical signal is well known in connection with facsimile machines and digital copying machines.

(Objective) An object of the present invention is to provide an optical image reading device that is one step further from the above-described document reading device and is capable of reading not only document images but also six-dimensional information such as landscapes.

(composition) The present invention will be explained below.

The optical solder reading device of the present invention includes a document placing glass, and a fixing means.

The document placement glass is for placing the document to be read on a flat surface. The original scanning means is a means for scanning an original placed flatly on the original placing glass.

The scenery scanning means is a means for scanning six-dimensional information other than the original, such as scenery.

The imaging lens is for forming an image of the scanned part onto the one-dimensional solid-state sensor. 1? lK former iron camera element is C
OD, BBD, etc., and the optical path length between the imaging lens and the one-dimensional solid-state image sensor is changed depending on whether the imaging lens performs scanning.

The housing is integrated with the document mounting glass, and is equipped with the document scanning means, landscape scanning means, imaging lens, one-dimensional solid-state imaging element, and optical path length changing means, and is arranged around a substantially horizontal axis. It is swingable.

The fixing means fixes the casing with the document placement glass rotated to a desired angle from the document reading position. When reading a document, place the document flat on the document placement glass. The original is placed in a fixed position, and the original is scanned and read by the original scanning means.

When reading scenery, the casing is tilted or stood up depending on the scenery to be read, and the scenery is scanned by the scenery scanning means. When reading landscapes, the optical path length between the imaging lens and the one-dimensional solid-state sensor is changed from the optical path length at the time of reading the original by the optical path length changing means, so that the field of the scanned area is changed to the one-dimensional sensor. The image should be focused on the top.

With such a configuration, the optical one-image reading device of the present invention can read not only original documents but also scenery such as a blackboard or a drawing iron on a screen.

Hereinafter, description will be given based on specific examples.

Figure 1 shows one practical example of the present invention. In the figure, the reference numeral 10 indicates a document placement glass, the reference numeral 20 a housing, the reference numeral 60 a support, the reference numeral 61 a shaft, and the reference numeral 62 a fixing screw.

The document placement glass 10 is integrated with the housing 20. Housing 2
0 is swingably supported by a support body 60 by a shaft 61.

A fixing screw 62 having a slot is screwed onto the support body 60d. When the fixing screw 62 is screwed into the support body 60, its tip comes into contact with the side surface of the housing 20.

Therefore, by further screwing in the fixing screw 62, the casing 20 can be fixed in an inclined position with respect to the support body 60 or in an upright position with respect to the support body 60 due to frictional force.

That is, in this embodiment, the support body 60 and the fixing screw 62 constitute fixing means.

FIG. 2 is an explanatory diagram showing the document reading position of the actual case shown in FIG. Note that some of the members inside the housing are drawn larger than their actual size ratios, and therefore, the size relationship of each part in the overall appearance of the housing differs from the actual relationship.

In FIG. 2, the reference numeral 12 indicates a lamp, the reference numeral 14 a plane mirror, the reference numeral 16 an imaging lens, and the reference numeral 18 a one-dimensional solid-state sensor element. Further, reference numeral 22 is a feed base, and reference numeral 24 is
1, reference numeral 26 indicates a ball screw, reference numeral 28 indicates a slope table, reference numeral 34 indicates a pulse motor 1, reference numeral 66 indicates a support, and reference numeral 38 indicates a ball screw, respectively. Further, the reference numeral 40 indicates a frame.

The pedestal 40 is fixed to the bottom of the casing 20, and the pulse motor 24 is fixed to the right end of the pedestal 40 so as to be able to rotate the ball screw 26.

The feed table 22 is screwed onto a ball screw 26, and when the ball screw 26 is rotationally driven by a pulse motor 24, it moves on the pedestal 40 according to the direction of rotation of the ball screw 26.
Move to the right or left in the fang 2 diagram.

As shown in the figure, the feed table 22 is equipped with an imaging lens 16, a plane mirror 14, and a slope table 28, as well as a lamp 12.
It's also hardwired. The lamp 12, the imaging lens 16, and the slope table 2 are fixed to the feed table 22, but the plane mirror 14
is swingably supported by a shaft P. The plane mirror 14 can be rotated in forward and reverse directions by a motor (not shown), and the feed base 22 is also equipped with a motor (not shown) for rotationally driving the plane #14.

As is clear from Figure 2, the imaging lens 16 used in this embodiment is a so-called in-mirror lens.

Now, the pulse motor fixed on the slope of the slope table 28.
Reference numeral 64 rotates a ball screw 68 , and the support body 36 that supports the one-dimensional solid-state image sensor 18 is screwed onto the ball screw 68 . Therefore, by rotationally driving the ball screw 68 by the pulse motor 64, the one-dimensional solid-state imaging one-quadrant element 18 can be displaced along the slope. The inclination of the inclined table 28 is determined by the angle of the imaging lens 16.
Therefore, it is parallel to the direction of the principal ray of the imaging light beam that forms an image on the one-dimensional solid-state imaging element 18, and therefore, the slope table 28
The optical path length between the single-arrow solid-state imaging element 18 and the imaging lens 16 can be changed along the slope.

As can be easily understood from the above explanation regarding Figure 2,
The document scanning means includes a lamp 12, a plane mirror 14, and a feeding table 22.
, a Hals motor 24, a ball screw 26, and a frame 40. In addition, the landscape scanning means includes a plane mirror 1
4 and a motor (not shown in Figure 2) for rotationally driving this. Further, the slope table 28, the pulse motor 64, the support body 66, and the ball screw 38 constitute optical path length changing means.

In addition, in FIG. 2, reference numeral 21 indicates a leg portion of the housing 20. This leg portion 21 comes into contact with the bottom surface 60' of the support body 30 in the document reading position. Furthermore, the code 20A is
A handle provided on the housing 20 is shown.

Now, when reading the original O, the original 0 is placed flatly on the original placing glass 10 as shown in Figure 2. In the original reading specification, the inclination of the plane mirror 14 with respect to the original mounting glass 10 is determined as shown in Figure 2, and the optical path length between the one-dimensional solid-state sensor 18 and the imaging lens 18 is as follows. The image of the scanned portion of the document O is determined to be formed on the one-dimensional solid-state sensor 18.

During reading, the armature 12 emits light and the motor 24 operates. As a result, the feed base 22 is connected to the ball screw 26K.
Therefore, on the frame 40, the spear moves at a constant speed from the position shown in FIG. 2 to the right. In this way, the original O is scanned. At this time, the one-dimensional solid-state image sensor 18 is driven, and the image information on the original O is read and converted into an electrical signal.

When reading landscapes, set the reading device to landscape reading specifications. Specification switching is performed using a switching button (not shown).

Then, the pulse motor 64 operates to rotate the ball screw 68, thereby displacing the one-dimensional solid-state image sensor 18 and bringing it to a position immediately behind the focal plane of the imaging lens 16. . In this way, the result [a
A scene that is at a sufficient distance from the lens 16 will be imaged on the surface of the one-dimensional solid-state imaging element 18 that includes the light-receiving section.

Note that the distance between the scenery to be read and the housing 20 may be measured, and the -C1 above-mentioned original path length may be adjusted more accurately according to this distance.

Next, the housing 20 is rotated around the shaft 61 using the handle 20A (counterclockwise in FIG. 2), the document mounting glass 10 is turned toward the scenery to be read, and the fixing screw 62 is used to rotate the housing 20. , the posture of the housing 20 is fixed.

Figure 6 shows the housing 20 fixed in an upright position relative to a support 60. The symbol O' is a scene to be read, for example, a picture drawn on a blackboard.

During reading, the plane mirror 14 is rotated clockwise around the support shaft by a motor (not shown) to scan the scene 0' to be read, and the one-dimensional solid-state sensor 18 sequentially captures optical images of the scanned area. Convert into electrical signal.

FIG. 4 schematically shows only the parts necessary for explaining another example of the present invention. Reference numeral 10' is a document placement glass, reference numeral 12'
is a lamp, code 50.52.54 is a plane mirror, code 56
Reference numeral 58 indicates an imaging lens (so-called through lens), and numeral 58 indicates a one-dimensional solid-state sensor.

When reading the original O, turn on the lamp 12',
The plane mirror 50 is integrally displaced to the right in Figure 4 at a speed ■, and at the same time, the plane mirror 52. ．． 54 as one body and displace it to the right in Fig. 4 at a speed of 1/2■. Of course, it goes without saying that the one-dimensional solid-state imaging device 58 is driven.

When reading a landscape, after changing the optical path length between the two by displacing the shaded lens 56 or the element 58 for one-dimensional solid-state imaging, tilt or stand up the housing (not shown), and place the document on the document mounting glass. 10' toward the landscape side, and the plane mirror 50 is aligned with the axis P.
Rotate clockwise around ' to scan.

In this way, the optical image reading device of the present invention can read not only originals but also landscapes. Therefore, if a finder is provided to determine the scenery to be read when reading the scenery, it becomes easier to set the posture of the casing when reading the scenery.

Two examples of such finders are shown in Figures 5 and 6.

In the example shown in Figure 5, a finder 60 consisting of an objective lens 61, a plane mirror 62, a lens 66, and a finder window 64 is housed in a corner of the housing 20' on the free swinging end side.

In the example shown in FIG. 6, the finder 70 is composed of a lens barrel 74, an objective lens 71, a lens 72, and a finder window 76, and is swingably attached to one corner of the housing 20'' by a swing shaft 76. It can freely enter and exit a small storage space 75 formed in the housing 20''.

As described above, in the present invention, the landscape is read by tilting or standing up the casing.However, as shown in Figure 7, a device similar to the present invention that can also read landscapes is used. , a support plate 110 is provided on the upper surface of the housing 200 so as to protrude above the document placement glass 100, and this support plate 11
A configuration in which a plane mirror 112 is provided at 0 is considered. The reading method may be the same as in the embodiment shown in Figure 1-i. In this case, since the plane mirror 112 is used,
There is no need to tilt or stand up the housing 200 when reading scenery.

The support plate 110 that supports the plane mirror 112 may be fixed to the housing 200 without a tie, or may be detachable from the housing 200 VC. Further, the inclination of the plane mirror 112 may be adjusted to 5. In addition, the image sensor is
It goes without saying that not only the above-mentioned -dimensional COD but also a two-dimensional image sensor (two-dimensional COD, two-dimensional camera tube) can be used.

(Effects) As described above, according to the present invention, a novel optical image reading device can be provided.

This optical image reading device can read not only originals but also landscapes, making it more versatile and convenient as a reading device.

[Brief explanation of drawings]

Figure 1 is an external perspective view showing one embodiment of the present invention, Figure 2 is a diagram for explaining document reading in the above embodiment,
Figure 6 is a diagram for explaining landscape reading in the above embodiment, Figure ')y4 is a diagram showing only the parts necessary for explanation of another accurate example of the present invention, Figures 2 and 5 are illustrations of the casing. Figure 6 is a diagram showing another example in which a finder is provided in the housing, and Figure 7 is a diagram for explaining a technique similar to the present invention. 10... Document placement glass, 20... Housing, 6D...
・Support, 16... One-dimensional lens, 18... One-dimensional solid-state imaging device, O... Manuscript, 0'... Scenery 1st figure bθ' 忤Δ figure -111%5 Figure Male (Figure 21 γn mer) Figure

Claims (1)

[Scope of Claims] 1. A document placement glass for placing the document flatly, a document scanning means for scanning the document, a one-dimensional solid-state sensor, and a landscape scanning device for scanning the landscape. means, an imaging lens for forming an image of the scanned portion on the one-dimensional solid-state sensor; a casing that houses a dimensional solid-state imaging device, a landscape scanning means, an imaging lens, and an optical path length changing means, is integral with the original document mounting glass, and is swingable around a substantially horizontal axis; , a fixing means for fixing the casing in a state where the document placing glass is rotated by a desired angle from the document reading position. 2. The optical image reading device according to claim 1, further comprising a finder for determining a landscape area to be read when scanning a landscape.