JPH02282215A - Optical scanner - Google Patents

Abstract

PURPOSE:To obtain the optical scanner which allows the sufficient miniaturization of the device by a scanning pattern generating means provided with a pair of reflection type holograms to face each other at both ends of a plane mirror disposed in the central part so as to intersect approximately orthogonally with each other. CONSTITUTION:The scanning pattern generating means 41 is constituted of the plane mirror 42 in the central part and a pair of the reflection type holograms 43, 44 disposed to face each other at both ends thereof. The mirror and the holograms are disposed together with pars, such as concave mirror 18 and polygonal mirror 23, in a housing 48. Bar codes 50a are attached to merchandise 50 existing above a reading window 30. A laser beam L1 is further reflected by a micromirror 51 provided on the concave mirror 18 and is made incident to the polygonal mirror 23. The laser beam is thereafter diffracted or reflected by any of the reflection type hologram 43, the plane mirror 42 or the reflection type hologram 44 constituting the scanning pattern generating means 41 to form the laser beam L2 which is further diffracted by the reading window 30 to the laser beam L3. This laser beam is emitted from the window 30 and scans the bar codes 50a of the merchandise 50.

Description

[Detailed Description of the Invention] Table of Contents Overview Industrial Application Fields Prior Art Figures 19, 20Δ, and 20B Problems to be Solved by the Invention Means for Solving the Problems Implementation Example 1 Figures - Figure 18 Summary of Effects of the Invention Regarding optical scanners, an object of the present invention is to provide an optical scanner that can sufficiently downsize the device, and which includes a light source that generates a laser beam, and a laser beam scanning device. means, a scanning pattern generating optical system for generating a scanning pattern for scanning an object to be read;
An optical scanner comprising a signal light condensing optical system that deflects the scattered signal light scattered by the object to be read and guides it to a photodetector, wherein at least one of the scanning pattern generation optical system or the signal light condensing optical system is provided. It is constructed using two reflection holograms.

INDUSTRIAL APPLICATION FIELD The present invention relates to an optical scanner that reads bar codes and the like using a hologram and a laser beam, and particularly relates to an optical scanner for a POS terminal.

As an optical scanner that scans a laser beam in accordance with a desired pattern, there is a hologram scanner that uses a porogram disk as a scanning means. By using a Holo or Durham disk as a scanning means, it has become possible to form complex scanning patterns with a simple optical system, and it has become possible to realize barcode readers with a deep reading depth.

A POS barcode reader (POS scanner), which is a type of optical scanner, reads the barcode on a product by moving it over a window and reading the barcode information with a laser beam. Optical system, scanning optical system, signal light detection optical system,
It consists of a waveform shaping circuit and a barcode symbol demodulation circuit.

A laser beam emitted from a He-Ne laser is adjusted to an appropriate beam diameter by a beam shaping optical system, a scanning pattern that can be universally read is formed by a scanning optical system, and a bar code is irradiated with this scanning pattern. Scattered light reflected from the barcode is collected by a signal light detection optical system, and a photodetector converts the signal light into an electrical signal. This electrical signal is shaped by a signal waveform shaping circuit, converted into numbers by a bar code symbol demodulation circuit, and sent to a POS terminal.

2. Description of the Related Art A conventional example in which a rotating polygon mirror is used as a laser beam scanning means and a transmission strip hologram is used as a reading window is disclosed in Japanese Patent Laid-Open No. 63-218914. Figure 19 shows an overview of the optical scanner described in this publication.
This will be explained with reference to FIGS. 20A and 20B. 19th
Referring to the figure, 10 is a reading window, and transmission band-shaped holograms 1'la and 1'la formed in different directions, respectively, are read windows.
Three transparent substrates 11.12.13 with 12a13a
Transmission type band-shaped holograms lla, 12a, and L3a are bonded and laminated to each other so as to intersect with each other. 19th
As shown in the lower part of the figure, below the reading window 10 is a scanning pattern generating mirror means 14 formed from three side mirrors 15, 16 and 17, and a concave mirror 18 having a through hole 18a and a curved reflective surface on its inner surface. , a bottom mirror 19 arranged parallel to the reading window 10, a photodetector 20. A mirror 21 and a polygon mirror 23 having five reflective surfaces that are rotationally driven by a motor 22 are provided. The optical components described above are mounted on a base (not shown) in a predetermined positional relationship together with the He-Ne laser tube 24, beam shaver 25, and reflection mirror 26 to form an optical scanner.

The operation will be explained with reference to FIGS. 20A and 20B. The laser beam emitted from the laser tube 24 is shaped into a beam diameter by a beam shaver 25 and then reflected by a reflection mirror 26 toward the concave mirror 18 side. As shown in FIG. 20A, the laser beam 28a reflected by the reflecting mirror 26 is transmitted through the through hole 18a.
through the through hole 1 and reflected by the rear mirror 27.
The light passes through 8a and is emitted to the polygon mirror 23.

This laser beam 28b is scanned within a predetermined range by the inclination and rotation of the reflective surface of the polygon mirror 23, and becomes scanning laser beams 28c and 28d that sequentially scan the three side mirrors 15, 16, and 17.

These scanning laser beams 28C and 28d are transmitted to the side mirror 15.
16. Reading window 10 via 17 and bottom mirror 19
The three transmission band-shaped holograms lla, 12a, and 13a having different directions are sequentially scanned. Laser beams 23e and 28 diffracted by the transmission strip hologram
f is emitted as a scanning line in a predetermined direction, and a desired scanning pattern is formed by these laser beams 28e and 28f.

On the other hand, as shown in FIG. 20B, the scattered signal light from the barcode fixed to the product is diffracted by the reading window 10 and enters the bottom mirror 19, and is then reflected by the bottom mirror 19, side mirror 16, and polygon mirror 23. The light is reflected one after another and enters the concave mirror 18. The scattered signal light reflected while being focused by the concave mirror 18 enters the photodetector 20 via the mirror 21 and is detected.

In the optical scanner having the above configuration, the laser beam is emitted from the reading window 10 such that a plurality of scanning lines in different directions intersect on all planes above the reading window 10, so that there is a gap between the reading window 10 and the barcode. This makes it possible to reduce the thickness of the device.

Problems to be Solved by the Invention However, in the optical scanner described in the above-mentioned publication, in order to generate scanning lines in three different directions on the reading window, the reading window is divided horizontally at the bottom. It is necessary to install three side mirrors. This 3
Since the side mirrors on both sides of the side mirrors are arranged so as to protrude to the outside of the reading window, the external shape of the optical scanner device must be made larger than the size of the reading window, making it impossible to make the device sufficiently compact. There was a problem. Furthermore, since the optical scanner has a two-story structure in which a side mirror is placed in the center above a concave mirror, there is a drawback that the device cannot be made sufficiently thin.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide an optical scanner that overcomes the above-mentioned drawbacks of the prior art and makes it possible to achieve miniaturization of the device.

Means for Solving the Problems According to one aspect of the present invention, a light source that generates a laser beam, a laser beam scanning means, a scanning pattern generating optical system that generates a scanning pattern for scanning an object to be read, and a scanning pattern generating optical system that generates a scanning pattern for scanning an object to be read; In an optical scanner equipped with a signal light condensing optical system that deflects the scattered signal light scattered by a reading object and guides it to a photodetector, the scanning pattern generating optical system or the signal light condensing optical system has at least one reflection. An optical scanner is provided that is characterized by using a mold hologram.

According to another aspect of the invention, an optical scanner has a reading window and is adapted to generate a plurality of scan lines on the reading window, the optical scanner comprising: a light source generating a laser beam; a rotationally driven polygon mirror that scans the polygon mirror; and at least one spaced-apart polygon mirror that deflects the laser beam reflected by the polygon mirror to generate a scanning pattern consisting of a plurality of scanning lines on the reading window. scanning pattern generating means including two reflection holograms; a photodetector for detecting scattered signal light scattered by an object to be read located near the reading window; deflecting the scattered signal light and concentrating it on the photodetector; An optical scanner is provided, comprising means for emitting light.

Preferably, the scanning pattern generating means includes a plane mirror disposed at the center, and a pair of reflection holograms disposed at opposite ends of the plane mirror so as to be substantially orthogonal to each other and facing each other.

According to still another aspect of the present invention, a light source that generates a laser beam, a rotationally driven polygon mirror that linearly scans the laser beam, a reading window, and a deflector that deflects the laser beam reflected by the polygon mirror. scanning pattern generating means for generating a scanning pattern consisting of a plurality of scanning lines on the reading window, a photodetector for detecting scattered signal light scattered by an object to be read located near the reading window, and the scattered signal. In an optical scanner including a condensing means for deflecting light and condensing it on the photodetector: the scanning pattern generating means is formed from a plurality of plane mirrors, and the condensing means and at least one of the plane mirrors are An optical scanner is provided that is integrated into a reflective hologram module.

Instead of the above-mentioned reflection hologram module configuration, the light condensing means may be formed from a reflection hologram having a light condensing function and arranged parallel to the reading window. Further, the scanning pattern generating means may be composed of a plurality of reflection holograms arranged in parallel facing the reading window.

Further, the scanning pattern generating means is constituted by a plurality of first reflection holograms arranged in parallel facing the reading window, and the light collecting means is constituted by a plurality of first reflection holograms having a light collecting function arranged parallel to the reading window. It may also be configured with a two-reflection hologram.

By selecting the interference fringes formed inside the hologram, that is, the spatial distribution of diffracted photons, an action-reflection hologram can control the relationship between the incident angle of the incident light that enters the hologram and the output angle of the diffracted light that exits the hologram. You can change your skills relatively freely. In the present invention, by using at least one reflection hologram having such characteristics in the scanning pattern generation optical system or the signal light condensing optical system, it is possible to realize miniaturization of the entire device, especially thinning of the device. I can do it.

Embodiments Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

First, a first embodiment of the present invention will be described with reference to FIGS. 1 and 2. In the description of this embodiment, the same reference numerals are given to substantially the same components as those of the above-mentioned prior art, and the description thereof will be omitted to avoid duplication. The features of this embodiment include a plane mirror 42 in which a scanning pattern generating mirror means 41 is disposed in the center, and a pair of reflection holograms 43 disposed at both ends of the plane mirror 42 facing each other so as to be substantially orthogonal to the plane mirror. 44.

The laser beam reflected by the polygon mirror 23 first scans the surface of the reflection hologram 43 in the direction shown by the broken line 45, then scans the surface of the plane mirror 42 as shown by the solid line 46, and then scans the surface of the reflection hologram 44. Scanning is performed as shown by a solid line 47.

Here, in the reflection hologram 43, interference fringes are formed such that the diffracted beam B1' of the laser beam B1 that irradiates P1 to P2 scans the reading window 30 over P1' to P2'. Moreover, the plane mirror 42 has P3~
Reflected beam B2 of laser beam B2 that irradiates up to P4
' is arranged so as to scan over the reading window 30 from P3' to P4'. In addition, the reflection hologram 44
is the laser beam B that irradiates the surface from P5 to P6.
3's diffracted beam B3' passes through the reading window 30''P5'~
Interference fringes are formed so as to scan over P6'.

Referring to FIG. 2, a concave mirror 1 is disposed within the housing 48.
8, a polygon mirror 23, a scanning pattern generating mirror means 41, and other parts are arranged, and a bar code 50a is printed on the product 50 above the reading window 30.

Here, the laser beam 1-Ll shown by the dotted line, which has been beam-shaped by a beam aper (not shown), is reflected by the mirror 26 and then reflected by the micromirror 5I provided on the concave mirror 18.
The light is further reflected and enters the polygon mirror 23. Thereafter, the laser beam reflected by the polygon mirror 23 is diffracted or reflected by any of the reflection hologram 43, plane mirror 42, or reflection hologram 44 constituting the scanning pattern generation mirror means 41, and becomes the laser beam L2. The laser beam L2 is further diffracted by the reading window 30 and becomes a laser beam L3, which is emitted from the reading window 30 and scans the code 50a of the product 50.

On the other hand, the scattered signal light S shown by the broken line from the barcode 50a
The bar code 50a is read by following substantially the same optical path as the incident beam in the reverse direction, entering the concave mirror 18, and then being reflected by the concave mirror 18 and focusing on a photodetector (not shown).

In the optical scanner having the above-mentioned configuration, the scanning pattern generating mirror means 41 is composed of reflective holograms 1, 43, 44 arranged in a U-shape and a plane mirror 42, so that the entire two devices can be made smaller. can. In place of the plane mirror 42, a reflective hologram is used, and C is of course preferably 3 degrees or less, FIGS. 3, 4A and 4B.
A second embodiment of the invention will now be described with reference to the figures.

, the conventional device and the first device described above in the description of this embodiment.
Components that are substantially the same as those in the embodiment are denoted by the same reference numerals, and description thereof will be omitted to avoid duplication.

In this embodiment, of the three mirrors constituting the scanning pattern generating mirror means 14 of the conventional device shown in FIG. It is installed as an integrated module 52, and the other components are the 19th module.
This is similar to the conventional device shown in the figure.

In FIG. 3, the reflection hologram module 52 is
A reflection hologram 54 having a predetermined mirror function is formed in the lower half region of a transparent substrate 53 such as glass, and a reflection hologram 55 having a predetermined concave mirror function is formed in the lower half region. A minute plane mirror 5 is located at the center of the reflection hologram 55 that has a concave mirror function.
6 is installed. The reflection hologram module 52 is fixed to the housing 48 by a fixture 57.

Next, with reference to Figures 4A and 4B,
The formation method will be explained. Fig. 4A shows an example of forming a reflection hologram with a normal mirror function and a light beam focusing function, and Fig. 4B shows an example of forming a reflection hologram with a concave mirror function. A transparent substrate 53 with a thickness of several μm made of gelatin mixed with silver
m photoresist films 58 are formed.

To form the reflection hologram 54 having a mirror function, as shown in FIG. 4A, the photoresist film 58 is irradiated with a vertically collimated plane wave laser beam Al, and
A laser beam A2 of a focused spherical wave converged at a predetermined angle α is irradiated from the transparent substrate 53 side at a predetermined incident angle β. Next, the photoresist film 58 is developed and fixed in a conventional manner to form a -j.rochram film 54a.

In the reflection hologram 54 formed in this way, the laser beam 83 incident from the same direction as the laser beams 1 and 1 is diffracted by the hologram film 54a.
', the laser beam A2 advances in the optical path direction σ, converges at the point P (1, and then continues straight ahead. Also, the laser beam traveling in the opposite direction along the optical path of the diffracted beam Δ3' is diffracted by the hologram film 34a, By selecting the convergence angle α and the incident angle β of the laser beam A2 to reverse the optical path of the laser beam A3, a plane mirror that meets predetermined conditions can be created in the hologram 54. On the other hand, in order to form a reflection hologram 55 having a concave mirror function, it is necessary to irradiate the photoresist film 58 with a vertically collimated plane wave laser beam A1 as shown in FIG. 4B. ), the transparent substrate 53 is irradiated with a spherical laser beam A2 having a convergence angle α perpendicularly from the transparent substrate 53 side, and is subjected to a regular development process to form a hologram film 55a4 on the photoresist film 58'.

In the reflection hologram 55 formed in this way, the laser beam incident from the direction of the laser beam LA1,
is diffracted by the hologram film 55a to become a diffracted beam 83', which travels in the direction opposite to the optical path of the laser beam AI, converges at a point P, and then travels straight. Further, the laser beam 1, which travels backward in the optical path of the diffracted laser beam A3', is diffracted by the hologram film 55a and travels backward in the optical path of the laser beam A3.

Therefore, by selecting the convergence angle α of the laser beam A2, it is possible to form a reflection hologram having the function of a concave mirror in which the distance to the convergence point P can be freely changed.

The optical path of this embodiment will be briefly explained below.

The laser beam is emitted from the tube 24 and the beam shaver 2
The laser beam L1 shaped into a predetermined diameter by the mirror 26 is further reflected by a micromirror 56 provided on the reflection hologram 5i5 and enters the polygon mirror 23i. Since the polygon mirror 23 is rotating at high speed, the laser beam incident from the micromirror 56 is reflected by the polygon mirror 2:3, and then passes through the scanning pattern generation mirror 15, the anti-fouling hologram 54, and the scanning pattern generation mirror 17. The laser beam is reflected or diffracted while sequentially scanning each surface of the reading window 3 (), and travels in two directions to become the beam L2.Then, it is engraved from the reading window 30 as a diffracted laser beam L3, and is engraved as a diffracted laser beam L3. The harness 50a of the product 51 located above the window 30 is scanned.

On the other hand, the scattered signal light S1 from the barcode 50a travels backward along almost the same optical path as the gunpowder beam, is emitted from a reflection hologram 55 having an ``r'' function, and is further emitted from the reflection hologram 55. The diffracted light S2 is focused on the photodetector 21 via the mirror 21, and
1. In an object scanner configured in this way, the scanning pattern generation mirror and the concave mirror, which conventionally had to be adjusted separately, are replaced by an integrated module with the same function as the scanning pattern generation mirror and the concave mirror. Since the mold holograms 54 and 55 are replaced, it becomes easy to attach these parts to the housing 48, and the number of man-hours for adjusting the entire device can be significantly reduced.

Next, an embodiment of the present invention will be described with reference to FIGS. The device is characterized by being configured by integrating the mirror with a reflective hologram that has a light focusing function, and this configuration eliminates the need for the concave mirror that was necessary in conventional devices, resulting in a thinner device. can be realized.

Referring to FIG. 5, a bottom optical plate 60 is provided parallel to the reading window 30. Bottom optical plate 60
is constructed by adhering a reflection hologram 62 having a predetermined diffraction function and light focusing function to a bottom mirror 61. The reflection type hologram 62 has a through hole 62a through which the laser beam from the laser beam 24 is transmitted.
is provided.

The other components of this embodiment are substantially the same as the conventional device shown in FIG. 19, although their arrangement is slightly different, so they will be given the same reference numerals and their explanation will be omitted.

Referring to FIG. 6A, a laser beam scanning optical path is shown, and the laser beam L1 emitted from the laser tube 24 passes through the through hole 62a provided in the reflection hologram 62 constituting the bottom optical plate 60, and passes through the polygon. It enters the mirror 23, is scanned by the polygon mirror 23, is sequentially reflected by the scanning pattern generating mirror means 14, and the bottom mirror 61, and is then diffracted by the transmission band-shaped hologram provided in the reading window 30 to form a beam L3. Next, the barcode 50a attached to the product 50 is scanned.

Referring to FIG. 6B, the return signal optical path is shown,
The scattered signal light S1 from the barcode 50a is transmitted to the reading window 3.
0 and becomes the signal light S2, which then travels backward along almost the same optical path as the incident beam, and then reaches the bottom optical plate 60.
However, since the reflection hologram 62 with a light focusing function is provided in the reach area of the signal light S2, the signal light S2 is diffracted in a predetermined direction and focused on the photodetector 20. Information on the barcode 50a is read.

In the optical scanner having the above configuration, the bottom optical plate 60 functions as the conventional bottom mirror and concave mirror, so the concave mirror required in the conventional device is no longer necessary, and the entire device can be made thinner. I can do it.

Referring to FIG. 7, a fourth embodiment of the present invention is shown, which differs from the third embodiment described above in that a plane mirror 63 is provided on the reflection hologram 62, and other The configuration is substantially the same as the third embodiment.

In this embodiment, the laser tube 24 and beam shaver 25 can be arranged between the reading window 30 and the bottom optical plate 60, so the overall thickness of the device can be further reduced compared to the third embodiment. I can do it.

Next, a fifth embodiment of the present invention will be described with reference to FIGS. 9, 10A, and 10B. In this embodiment, instead of the scanning pattern generating mirror means 14 of the conventional device shown in FIG. 65 is provided. Since the other components are substantially the same as the conventional device shown in FIG. 19, they will be given the same reference numerals and their explanation will be omitted.

The path of the scanning laser beam will be described with reference to FIGS. 9 and 10A. The laser beam L1 emitted from the laser tube 24 is shaped by a beam shaver 25 and then passed through a through hole 18a provided in the concave mirror 18.
The light is incident on the polygon mirror 23 which is rotationally driven. Since this polygon mirror 23 is rotating at high speed, the laser beam is reflected by the polygon mirror 23 and then passes through the scanning pattern generating hologram 65 arranged parallel to the reading window 30 as shown in FIG. The constituent reflection holograms 66, 67 and 68 are continuously scanned in the direction of the arrow in the figure. Scanning pattern generation hologram 6
The laser beam L2 diffracted at
3a, and is diffracted by these band-shaped holograms to become a laser beam L3, which scans the barcode 50a attached to the product 50.

On the other hand, the scattered signal light S1 of the barcode 50a is
As shown in the figure, it enters the reading window 30, becomes a diffracted signal light S2, and proceeds inside the device.Then, it travels backward along almost the same path as the scanning laser beam and enters the concave mirror 18. The reflected signal light is focused on the photodetector 20, and the information on the barcode 50a is read.

In the optical scanner configured in this way, the 19th
Since a scanning pattern generating hologram 65 arranged parallel to the reading window 30 is provided instead of the scanning pattern generating mirror means of the conventional device shown in the figure, the entire device can be made thinner, and the conventional scanning pattern generating mirror can be made thinner. The number of man-hours required for adjusting the optical axis of the means can be reduced.

11 and 12 show a sixth embodiment of the present invention, which includes all the components of the fifth embodiment described above, and most of these components are made of acrylic resin or A flat transparent block 7 made of glass or the like
It is constructed by adhering to 0. That is, the reading window 30 having a plurality of transmission band-shaped holograms is adhered to the top surface of the flat transparent block 70, and the reflection holograms 66.
67 and 68 are glued together. Also, transparent block 7
The back surface of 0 is formed into a convex spherical surface corresponding to the concave mirror 18, and the concave mirror 18 is bonded to this portion.

A cavity 71 is provided in the transparent block 70 at the mounting part of the polygon mirror 23 and the mounting part of the reflective mirror 21, respectively.
．． 72 is formed.

Since the operation of this embodiment is similar to that of the fifth embodiment described above, the explanation thereof will be omitted. In this embodiment, most of the optical system is glued and integrated into a flat transparent block, so there is no need to individually adjust the optical axis of each element that makes up the optical system, and the number of assembly steps can be reduced. be.

It is confirmed that, instead of bonding the concave mirror 18 to the transparent block 70, the same effect can be obtained by forming, for example, an aluminum vapor-deposited film on the convex spherical surface of the transparent block 70.

Next, a seventh embodiment of the present invention will be described with reference to FIGS. 13 to 15. This embodiment is similar to the sixth embodiment shown in FIG. 11, in which instead of the concave mirror 18 glued to the back of the transparent block 70 in FIG.
A condensing reflection hologram 75 is adhered to the bottom surface of a transparent block 70. In the condensing reflection type hologram 75, a small area in the center forms a normal plane mirror 75a, and the entire surface except for this plane mirror 75a has a light converging function and diffracts the light from the polygon mirror 23 in a predetermined direction. A reflection hologram 75b is provided. The other configurations are the same as those of the sixth embodiment shown in FIG. 11, so the explanation thereof will be omitted.

Thus, the laser beam L1 is emitted from the laser tube 24 and shaped into a predetermined beam diameter by the beam shaver 25.
After entering the transparent block 70 , the light is totally reflected by the plane mirror 75 a of the condensing reflection hologram 75 and enters the polygon mirror 23 . Since the polygon mirror 23 is rotating at high speed in the direction of the arrow shown in the figure, its reflected beam scans the reflection holograms 66, 67 and 68 constituting the scanning pattern generation hologram 65 in the direction of the arrow shown, and the diffracted beam L2 passes through the reading window. The barcode 50 of the product 50 is emitted from a predetermined area of the product 50 as a diffracted scanning beam L3.
Scan a.

On the other hand, the scattered signal light S1 on the return path enters the transparent block 70 from the reading window 30, and then travels backward along an almost same optical path as the scanning beam on the outgoing path, and passes through the scanning pattern generation hologram 65,
Condensing reflection hologram 7 via polygon mirror 23
The light reaches the periphery of the planar mirror portion 75a of No. 5, that is, the region of the reflection hologram 75b having a light focusing function. The reflected hologram 75b diffracts the scattered signal light 81 in a predetermined direction and focuses it on the photodetector 20.
Information of 0a is read.

The optical scanner of this embodiment described above is the 19th
Since the concave mirror required in the conventional device shown in the figure is not required, the entire device can be made thinner and lower in price.

Referring to FIG. 16, an eighth embodiment of the present invention is shown, in which only the condensing reflection hologram 75 of the seventh embodiment shown in FIGS. is equipped with a reflection hologram 76a for diffraction of a fine incident laser beam, and the periphery thereof is replaced with a condensing reflection hologram 76 formed by a reflection hologram 75b having a light focusing function similar to that of the seventh embodiment. The configuration of other parts is the same as that of the seventh embodiment.

In this embodiment, the reflection hologram 76a for diffraction of the incident laser beam can freely change the incident angle of the laser beam and the output angle of the diffracted beam when forming the hologram 76a. Therefore, by appropriately setting the incident angle of the laser beam and the output angle of the diffracted beam, the laser duplex 24 and beam shaver 25 can be moved to the photodetector 2 as shown by the dotted line L1.
0 and 7 on the same board.
7" The entire device that can be installed in the second location can be further miniaturized.

Finally, a ninth embodiment of the present invention will be described with reference to FIGS. 17 and 18. This embodiment is a transmission hologram that transmits an incident laser beam in the center and emits diffracted light in a predetermined direction, instead of only the condensing reflection porogram 75 of the seventh embodiment shown in FIGS. 13 to 15. 78a, the periphery of which is a reflective hologram l similar to that of the seventh embodiment.
, 75 b.
8, and the other components are the same as those of the seventh embodiment.

In this embodiment, since it is necessary to transmit the incident laser beam L1 through the transmission hologram 78a,
The laser tube 24 must be placed below the condensing reflection hologram 78, but it must be placed below the transmission hologram 78a.
When forming a portion, the hologram 78a can be given a beam shape correction function. Therefore, since the beam shaver 25 that was conventionally required is no longer necessary, the device can be made smaller and lower in price.

Effects of the Invention Since the optical scanner of the present invention uses at least one reflection hologram for the scanning pattern generation optical system or the signal light condensing optical system, the optical scanner can be made smaller and thinner as a whole. This has the effect that the device can be provided.

[Brief explanation of drawings]

FIG. 1 is a schematic perspective view of the first embodiment of the present invention with the concave mirror omitted. FIG. 2 is a partially cutaway view of the first embodiment of the present invention. FIG. 3 is a schematic perspective view of the second embodiment of the invention. Partially cutaway schematic perspective view Figure 4A is a diagram for explaining a method of forming a reflection hologram having a normal mirror function and a laser beam focusing function; Figure 4B is a view showing a method of forming a reflection hologram having a concave mirror function. FIG. 5 is a partially cutaway schematic perspective view of the third embodiment of the present invention; FIG. 6A is a schematic side view showing the optical path of the scanning laser beam of the third embodiment; FIG. 6B is a schematic side view showing the optical path of the scattered signal light of the third embodiment described above; FIG. 7 is a partially cutaway schematic perspective view of the fourth embodiment of the present invention; FIG. 8A is a schematic side view of the fourth embodiment of the present invention; FIG. 8B is a schematic side view showing the optical path of the scattered signal light of the fourth embodiment described above; FIG. 9 is a partially cutaway schematic perspective view of the fifth embodiment of the present invention. Figure 10A is a schematic side view showing the optical path of the scanning laser beam of the fifth embodiment described above; Figure 10B is a schematic side view showing the optical path of the scattered signal light of the fifth embodiment described above. A partially cutaway (simplified perspective view) of the sixth embodiment of the present invention; FIG. 12 is a schematic side view showing the optical path of the scanning laser beam and the optical path of the scattered signal light of the sixth embodiment described above; FIG. FIG. 14 is a partially cutaway schematic perspective view of the seventh embodiment, and FIG. 15 is a partially cutaway side view thereof, showing the relative positional relationship of each component. FIG. 17 is a schematic side view of the ninth embodiment of the present invention; FIG. 18 is a partially cutaway plan view of the ninth embodiment of the present invention; Figure 19 is an exploded perspective view of a conventional optical scanner using a 1m transmission type optical scanner as the reading window. Figures 20A and 20B are the conventional optical scanner shown in Figure 1 It is a schematic side view showing the optical path state of the power scanner. ],, 0.30 reading window, ], la, ], 2a, l 3a... Transmissive strip hologram, 14.41... Scanning pattern generation mirror means,
18...Concave mirror 19...Bottom mirror 20...Photodetector, 23.Polygon mirror 24...Laser tube, 43.44...Reflection hologram, 50...Product, 50a...Barcode, 52.Reflection hologram module, 60..Bottom optical plate, 65..Scanning pattern generation hologram, 70..
Flat transparent block. 1st prisoner group・10-pursuing cutting face pi FIG. 2 1゛Invitation example Atonement view n FIG.
Figure +B

Claims (1)

[Claims] 1. A light source that generates a laser beam, a laser beam scanning means, a scanning pattern generation optical system that generates a scanning pattern for scanning an object to be read, and a scattering signal scattered by the object to be read. An optical scanner equipped with a signal light focusing optical system that deflects light and guides it to a photodetector, characterized in that at least one reflection hologram is used in the scanning pattern generation optical system or the signal light focusing optical system. optical scanner. 2. An optical scanner having a reading window (30) and adapted to generate a plurality of scan lines on the reading window, the light source (24) generating a laser beam; a polygon mirror (23) that is rotationally driven to scan; and a polygon mirror (23) spaced apart from each other that deflects the laser beam reflected by the polygon mirror to generate a scanning pattern consisting of a plurality of scanning lines on the reading window (30). scanning pattern generating means (41) including at least two reflection holograms (43, 44) arranged at the reading window (
30) a photodetector (20) for detecting scattered signal light scattered by an object to be read (50) located nearby; means (18) for deflecting the scattered signal light and focusing it on the photodetector; An optical scanner consisting of. 3. The scanning pattern generating means (41) includes a plane mirror (42) arranged in the center, and a pair of reflection holograms ( 43, 44). The optical scanner according to claim 2. 4. A light source (24) that generates a laser beam, a rotationally driven polygon mirror (23) that linearly scans the laser beam, a reading window (30), and a laser beam that is reflected by the polygon mirror. scanning pattern generating means that deflects and generates a scanning pattern consisting of a plurality of scanning lines on the reading window; and a light detector that detects scattered signal light scattered by an object to be read (50) located near the reading window. In the optical scanner, the scanning pattern generating means includes a plurality of plane mirrors (15,
17, 54), wherein the light condensing means (55) and at least one of the plane mirrors (54) are integrated to form a reflection hologram module (52). 5. A light source (24) that generates a laser beam, a rotationally driven polygon mirror (23) that linearly scans the laser beam, a reading window (30), and a laser beam that is reflected by the polygon mirror. scanning pattern generating means (14) that deflects to generate a scanning pattern consisting of a plurality of scanning lines on the reading window; detecting scattered signal light scattered by an object to be read (50) located near the reading window; In an optical scanner, the optical scanner includes a photodetector (20) that deflects the scattered signal light and focuses the scattered signal light on the photodetector. Reflection hologram (62) with light focusing function arranged in parallel
An optical scanner characterized by comprising: 6. The light source (24) on the reflection hologram (62)
5. A through hole (62a) is provided for transmitting a laser beam from the polygon mirror (23).
Optical scanner listed. 7. Place the light source (24) on the reflection hologram (62).
6. The optical scanner according to claim 5, further comprising a plane mirror (63) that reflects the laser beam from the polygon mirror (63) toward the polygon mirror (23). 8. A light source (24) that generates a laser beam, a rotationally driven polygon mirror (23) that linearly scans the laser beam, a reading window (30), and a laser beam that is reflected by the polygon mirror. scanning pattern generating means that deflects and generates a scanning pattern consisting of a plurality of scanning lines on the reading window; and a light detector that detects scattered signal light scattered by an object to be read (50) located near the reading window. In the optical scanner, the scanning pattern generating means is arranged to face the reading window (30), and a focusing means (18) deflects the scattered signal light and focuses it on the photodetector. Multiple reflection holograms (66
, 67, 68). 9. The condensing means is composed of a concave mirror (18), and the reading window (30) and the plurality of reflection holograms (
66, 67, 68). The optical scanner according to claim 8, wherein the concave mirror (18) is bonded and integrated with the outer surface of a flat transparent block (70). 10. A light source (24) that generates a laser beam, a rotationally driven polygon mirror (23) that linearly scans the laser beam, a reading window (30), and a laser beam that is reflected by the polygon mirror. scanning pattern generating means that deflects and generates a scanning pattern consisting of a plurality of scanning lines on the reading window; and a light detector that detects scattered signal light scattered by an object to be read (50) located near the reading window. In the optical scanner, the scanning pattern generating means is parallel to and facing the reading window (30); A second reflection hologram (66, 67, 68) having a light collecting function, the light collecting means being arranged parallel to the reading window (30); 75). 11. The reading window (30) is replaced with a flat transparent block (
70) and the first (66, 67, 68)
The optical scanner according to claim 10, wherein a second reflection hologram (75) is adhered to the bottom surface of the flat transparent block (70). 12. The optical scanner according to claim 11, wherein the second reflection hologram (75) is provided with a mirror region (75a) having no light focusing function in the center thereof. 13. The optical scanner according to claim 12, wherein the mirror area is comprised of a reflective hologram (76a). 14. The optical scanner according to claim 11, wherein a transmission hologram (78a) having no light condensing function is provided in the center of the second reflection hologram (75). 15. The optical scanner according to claim 2, wherein a plurality of transmission holograms (31a, 32a, 33a) are provided on the reading window (30).