JPS60237424A - Hologram scanner - Google Patents

Abstract

PURPOSE:To obtain a hologram scanner which is small-sized and oscillates less by providing a mechanism for generating a rotating magnetic field around a holo top and making common use of the holo top itself as a shaft and a rotor. CONSTITUTION:The scanner is constituted of the holo top 20, electromagnets 26 and a sensor 27. The outside circumferential member 24 of the holo top 20 is formed of a magnetic material. The holo top is freely rotatably supported by means of a bearing 25. Holograms 21, 22 are mounted to the lower two surfaces thereof and a transmission type Fresnel lens 23 is provided to the inside. Plural pieces of the electromagnets 26 are disposed equidistantly to the outside circumference of the top 20 in promixity thereto so that the rotating magnetic field is generated when electric current is supplied thereto. The sensor 27 is provided at the focusing point of the reimaging light on the central axis of rotation of the top 20. The top 20 is rationally driven by the rotating magnetic field generated when the electric current is supplied to the electromagnets 26. The reimaging light 28 incident on the holograms 21, 22 is condensed by the holograms 21, 22 and the lens 23 and is read by the sensor 27.

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, in order to save labor at registers in supermarkets and the like, barcode reading devices have come into use that read barcodes printed on the exterior of products and input them into combi-machine computers. A hologram scanner using a hologram is suitable for the optical scanning section of this 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 represents incident light, 5.5' represents a reflecting mirror, 6 represents a window glass, 7 represents a window cover, and ■ and ■ represent scanning light, respectively. In this hologram scanner, by rotating the holotop 1, the laser beams 4 are made to alternately enter the holograms 2 and 3, and the scanning beams 2 and 3 are alternately emitted from the slits in the window cover 7. Further, as shown in FIG. 2, the re-imaging 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 barcode enters the sensor 10 and the barcode is read.

Prior Art and Problems As POS systems become more widespread, it has become necessary to consolidate functions into a single module in order to miniaturize and facilitate manufacturing of such hologram scanners. Ta. However, in the conventional holotop, as the reimaging light 8 passes through the inside of the holotop 1 as shown in FIG. It becomes. For this reason, the height of the mortar is an obstacle to miniaturization. There was also a drawback that there was a large vibration when rotating the shaft inside the holotop.

OBJECTS 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 can be downsized and has a holotop with less vibration.

According to the present invention, a hologram scanner performs all scanning of p-laser diffraction light by rotating a holotop, in which the holotop is provided with a rotating magnetic field generation mechanism around it, and the holotop itself This is achieved by providing a hologram scanner characterized in that it also serves as a rotor.

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 hologram scanner according to the present invention, in which a is a longitudinal cross-sectional view and b is a cross-sectional view taken along line bb in FIG. a. In the same figure, 20 is a holotop,
21, 22i1: Hologram, 23 is 7 Lenel lens,
Reference numeral 24 indicates an outer peripheral member of the holotop, 25 a bearing, 26 an electromagnet, 27 a sensor, and 28 a reimaging light.

This embodiment has a holotop 20 and an electromagnet 2 as shown in FIG.
6 and a sensor 27, the holotop 20
The outer circumference member 24 is made of a magnetic material, the outer circumference is rotatably supported by a bearing 25, holograms 21 and 22 are attached to the lower two surfaces, and a transmission type Fresnel lens 23 is provided inside. . A plurality of electromagnets 26 are arranged at equal intervals close to the outer periphery of the holotop, and a rotating magnetic field is generated when a current is supplied. Further, the sensor 27 is disposed at the focal point of the re-imaging source on the rotational center axis of the holotora 'f20. and electromagnet 26
The holographic top 20 is rotationally driven by a rotating magnetic field generated by supplying current to the hologram 21.22, and the re-imaging light 28 incident on the hologram 21.22 is focused by the hologram 21.22 and the Fresnel lens 23, and the sensor 27 It can be read easily.

This embodiment configured in this way is inside the Holotop! By making it possible to change the conventional reflection type Fresnel lens to a transmission type Fresnel lens, and at the same time change the sensor position, the area of the hologram can be expanded and the reading performance can be improved. In addition, conventionally the height of the holotop was determined by the focal length f of the reflective Fresnel lens (see Figure 2), but with the use of a transmissive Fresnel lens, the height of the holotop can be adjusted freely as it is not affected by the multi-focal length. By integrating the drive motor and holotop, the height of the simulator can be reduced and a thin scanner can be realized. Since the holotop itself is the axis in the awn, vibration during rotation is reduced compared to the conventional V-shaped lower type (Fig. 3).

It should be noted that the present invention can achieve similar effects of making the conventional HoloTozzo scanner using a reflective Fresnel lens thinner and completely reducing vibration during rotation.

Effects of the Invention As explained in detail, the hologram scanner of the present invention has great effects such as being able to be miniaturized and having less vibration by integrating the hologram scanner with the drive motor using the holotop itself as the axis. It is something.

[Brief explanation of the drawing]

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 hologram scanner according to the present invention. It is a diagram. In the drawings, 20 is a holotop, 22 is a hologram, 23 is a Fresnel lens, 24 is an outer peripheral member of the holotonop, 25 is a bearing, 26 is an electromagnet 27 is a sensor, and 28 is a reimaging light. Patent Applicant: Fujitsu Limited Patent Attorney Akira Aoki Patent Attorney Kazuyuki Nishidate 1) Yukio Patent Attorney Akira Yamaguchi Figure 1 Figure 2 Figure 3

Claims (1)

[Claims] 1. A hologram scanner that scans a laser diffraction source by rotating a holotop f, which is characterized in that the holotop f is provided with a rotating magnetic field generation mechanism around it, and the holotop itself serves as both a shaft and a rotor. hologram scanner.