JPS6446869U - - Google Patents

Description

[Brief explanation of the drawing]

1 to 6 are diagrams showing a first embodiment of a gun-type scanning barcode reader according to the present invention, and FIG. 1 shows the arrangement of the gun-type scanning barcode reader. 2 is a plan view of the rotation holding member as the switching means shown in FIG. 1, and FIGS. 3A and 3B schematically show the action of the wedge-shaped optical member shown in FIG. 1. FIG. 4 is a diagram showing the output state of the read signal of the scanning barcode reader, FIG. 5 is a plan view showing a first modification of the rotary holding member shown in FIG. 2, and FIG. FIG. 7 is a plan view showing a second modification of the rotation holding member shown in FIG. 2, and FIGS. 7 and 8 are views showing a second embodiment of the scanning barcode reader. 8 is a sectional view showing the wedge-shaped optical member and switching means of the scanning barcode reader, FIG. 8 is an optical path diagram schematically showing the action of the wedge-shaped optical member shown in FIG. 7, and FIGS. FIG. 10 is a diagram showing a third embodiment of a scanning barcode reader according to the present invention, and FIGS. 11 to 14 are diagrams for explaining a conventional gun-type scanning barcode reader. Figure 11 is a diagram showing a schematic configuration of the scanning barcode reader, Figure 12 is an optical diagram schematically explaining the beam waist based on the projection lens of the scanning barcode reader, and Figure 13 is its optical diagram. FIG. 14 is an explanatory diagram showing the illumination state of the object to be scanned 8, and FIG. 14 is an optical diagram schematically illustrating a state in which the beam waist by the projection lens of the scanning barcode reader is formed at a farther distance. be. DESCRIPTION OF SYMBOLS 1... Barcode reader, 3... Semiconductor laser, 4... Light projecting lens, 5... Polygon mirror, 6... Condensing lens, 7... Photoelectric conversion element, 9... Beam waist, 12... Coreless motor, 16... Pulley gear body, 25 ...Rotation holding member, 28... Wedge-shaped optical member.

Claims (1)

[Claims for Utility Model Registration] (1) An emitted laser beam emitted through a projection lens is deflected and projected onto an object to be scanned, and the emitted laser beam reflected by the object to be scanned is converted into a return beam. In a scanning optical reading device that receives light as a beam and reads information on the scanned object, at least a portion thereof includes a wedge-shaped optical member for changing the position of a beam waist of the emitted laser beam with respect to the projection lens. The wedge-shaped optical member is provided on at least one of the incident side and the exit side of the emitted laser beam with the projection lens as a boundary so as to be able to enter the optical path of the emitted laser beam, and is provided in the optical path of the emitted laser beam of the wedge-shaped optical member. A scanning optical reading device comprising a switching means for switching an entering portion between a position of entry into the optical path of the emitted laser beam and a position of retreat from the optical path of the emitted laser beam. (2) the wedge-shaped optical member is plural;
The scanning optical reading device according to claim 1, wherein each of the wedge-shaped optical members has a different refractive index from each other. (3) The wedge-shaped optical member is attached to a rotational holding member, and the switching means rotates the rotational holding member so that the portion of the wedge-shaped optical member that enters the optical path of the emitted laser beam is connected to the emitted laser beam. The scanning optical reading device according to claim 1, wherein the scanning optical reading device is configured to switch between a position where the emitted laser beam enters the optical path and a position where the emitted laser beam retreats from the optical path. (4) The switching means switches the wedge-shaped optical member between a position where it enters the optical path of the emitted laser beam and a position where it retreats from the optical path of the emitted laser beam by manual operation. A scanning optical reading device according to claim 1. (5) The wedge-shaped optical member is constituted by a cylindrical plate-shaped optical member having a wedge-shaped cross section, and the cylindrical plate-shaped optical member is rotated about the center of the rotation axis, so that the emitted laser beam of the wedge-shaped optical member is rotated. 2. The scanning optical reading device according to claim 1, wherein the scanning optical reading device is configured to continuously change the thickness of the portion that enters the optical path.