JPS60252318A - Hologram scanner - Google Patents

Abstract

PURPOSE:To make a holotop for optical scanning and condensation of a reflected signal light small-sized to make the whole of a hologram scanner device small-sized by adhering anothr deflecting optical element to or putting it above a hologram of a peg-top hologram rotating body. CONSTITUTION:Deflecting optical elements 23 an 24 consisting of holograms, transmission Fresnel lenses, or the like are adhered to holograms 21 and 22 provided on a holotop 20. A laser beam 27 is made incident on the hologram 21 or 22 and is deflected to become scanning light 28, and this light is reflected on a bar code or the like to become a reflected signal light 29, and this light is condensed by holograms 21 and 22 and the deflecting optical element 23 or 24 and is condensed on a photodetector 26 which is on the axis of a revolving shaft 25. Thus, the cylinder part required as a space for condensation in a conventional holotop is eliminated to make the holotop small-sized.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field of the Invention The present invention relates to a hologram scanner that performs optical scanning using a hologram.

Background of the Technology Recently, barcode readers have been used to read barcodes printed on the exterior of products and input them into computers in order to save labor at registers in supermarkets and the like. A hologram scanner using a hologram is suitable for the optical scanning section of a barcode reading device, and therefore, this hologram scanner is often used.

Figure 1 is a diagram for explaining the optical system configuration of a hologram scanner, and 1 is a spinning top-shaped hologram rotating body (hereinafter referred to as holotop) with holograms 2 and 3 mounted on two sides.
, 4 is a laser beam, 5° 5' is a reflecting mirror, 6 is a window glass, 7 is a window cover, and ■ and ■ are scanning lights, respectively. In this hologram scanner, by rotating the holotop 1, a laser beam 4 is alternately incident on the holograms 2 and 3, and scanning beams (1) and (2) are alternately emitted from a slit in a window cover 7. Further, as shown in FIG. 2, the reconvergent light 8 reflected from the barcode travels in the opposite direction to the scanning light, enters the holograms 2 and 3, and is reflected and converged by a reflective 7-Renel lens 9 provided in the holotop 1. The light then enters the photodetector 10 located at the center of the rotation axis, and the barcode is read.

Prior Art and Problems Conventionally, a holotop with the two functions of optical scanning and reflected signal focusing has been shown in Fig. 2 or 3 (in the same figure, the
The same parts as in the figures are indicated with the same reference numerals. k o 11.1
2 is a mirror surface). However, with a holotop like this, a small motor can generate speeds of 6 per minute.
It is difficult to sustain high speed rotation of 0,000 revolutions, and there is a drawback that the entire device including the motor, power source, etc. cannot be sufficiently miniaturized.

Purpose of the Invention In view of the above-mentioned drawbacks of the conventional art, it is an object of the present invention to provide a hologram scanner that miniaturizes the holotop that performs optical scanning and condenses reflected signal light, thereby making it possible to miniaturize the entire device. .

Structure of the invention and this object according to the invention uses a hologram,
In a hologram scanner equipped with a spinning top-shaped hologram rotating body that has two functions of optical scanning and reflected signal light focusing, another deflection optical element is superimposed on the hologram of the spinning top-shaped hologram rotating body, either in close contact or separated from each other. This is achieved by providing a hologram scanner characterized by:

Examples of the invention Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 4 is a diagram for explaining the first embodiment of the hologram scanner according to the present invention, in which a is a perspective view of the holotop, and b is a sectional view taken along line bb in FIG.

In the figure, 20 is a holotop, 21.22 is a hologram, 23.24 is a deflection optical element, 25 is a rotation axis, and 26
is a photodetector, 27 is a laser beam, 28 is a scanning light, 29
indicate reflected signal light, respectively.

In this embodiment, deflection optical elements 23 and 24 are provided on a holotop 20 in close contact with holograms 21 and 22, respectively, which have conventional optical scanning and reflected signal light focusing functions. Note that as the deflection optical elements 23 and 24, for example, a hologram or a transmission type Fresnel lens is used. Further, the deflection optical elements 23 and 24 are provided with a groove-shaped window in a portion through which the laser beam 27 passes.

In this embodiment configured as described above, the laser beam 27 is incident on the hologram 21 or 22 and is deflected to become the scanning light 28. The reflected signal light 29 is a hologram 21
．． 22 and a deflection optical element 23 or 24, and the light is focused on a photodetector 26 located on the central axis of the rotating shaft 25. In this way, in this embodiment, the reflected signal light 29 is transmitted to the hologram 21.
After passing through 22, it further passes through deflection optical elements 23 and 24, so the focusing distance can be shortened, and the cylindrical part that was reserved as a space for focusing light in conventional holotops can be removed. miniaturization is achieved.

FIG. 5 is a diagram for explaining the second embodiment, in which a is a perspective view of the holotop, and b is a sectional view taken along line bb in FIG.

In this figure, the same parts as in FIG. 4 are designated by the same reference numerals. Note that 30 is a specular or reflective Fresnel lens.

The difference between this embodiment and the previous embodiment is that the holotop 20
A ψ-plane or reflective Fresnel lens 30 is attached to the lens, and the rotating shaft 25f is brought out from the opposite side. In this case, the reflected signal light 29 passes through the hologram 21 . 22 and the deflection optical element 23 . The light is focused on.

The effects of this embodiment are similar to those of the previous embodiment, but when the deflection optical elements 23 and 24 are Fresnel lenses, the condensing distance can be further shortened and the cylindrical top can be further miniaturized.

FIG. 6 is a sectional view for explaining the third embodiment.

In this figure, the same parts as in FIG. 4 are designated by the same reference numerals. 31j mirror or reflective Fresnel lens, 3
1.32 each shows a hologram.

This embodiment differs from the previous embodiment in that the laser beam 2
Hologram 3 to periodically deflect 7 in different directions
1.32 is incorporated, and two holograms on both left and right sides are separated and superimposed. In addition, hologram 21~
24, 31, and 32 wheels are created in different ways.

The effect of this embodiment is that the laser beam 27 is periodically scanned by the scanning light 2.
It is the same as the second embodiment except that it is emitted as 8.28'.

Effects of the Invention As described in detail above, the hologram scanner of the present invention can shorten the condensing distance of the reflected signal light passing through the hologram by superimposing a deflection optical element on the hologram of the hologram. 9. The cylindrical part of the conventional holotop, which was reserved as a space for condensing light, was removed to achieve a smaller size, which made it possible to downsize the motor, power supply, etc., and significantly downsize the entire device. This has a great effect in making it possible.

[Brief explanation of drawings]

FIG. 1 is a diagram for explaining the optical system configuration of a conventional hologram scanner, FIGS. 2 and 3 are diagrams for explaining the holotop, and FIG. 4 is a diagram for explaining the holotop in the hologram scanner according to the present invention. FIG. 5 is a diagram for explaining the second embodiment, and FIG. 6 is a diagram for explaining the second embodiment.
The figure is a diagram for explaining the third embodiment. In the drawing, 20 is a hollow top, 21, 22° 31.
32 is a hologram, 23.24 is a deflection optical element, 25 is a rotation axis, 26 is a photodetector, 27 is a laser beam, 28.
28' is a scanning light, 29 is a reflected signal light, and 30 is a specular or reflective Fresnel lens. Patent applicant Fujitsu Limited Patent application agent Akira Aoki Patent attorney Kazusa Nishidate Patent attorney Yukio Uchida Akira Yamaguchi, Figure 1 Figure 2

Claims (1)

[Claims] 1. Using a hologram, 2. optical scanning and reflected signal light focusing.
Equipped with functions. A hologram scanner equipped with a spinning top-shaped hologram rotating body, characterized in that another deflection optical element is superimposed on the hologram of the spinning top-shaped hologram rotating body, either in close contact or separated from each other. 2. The hologram scanner according to claim 1, wherein the evenly oriented optical element is a hologram or a Fresnel lens.