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1. (WO1997015216) SCANNING DEVICE FOR INDUSTRIAL APPLICATIONS
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CLAIMS

1. Device for scanning one or more bar codes on an object in an industrial environment, comprising;
- a housing provided with a window for passage of one or more scanning radiation beams and of radiation induced by a bar code;
- one or more plate-like components on which are arranged a radiation source, a sensor sensitive to the radiation and further electronic, optical and mechanical components;
- a polygonal rotatable mirror for generating scan lines from the radiation beams and drive means therefor; and
- placing means for placing the plate-like components and the optical, mechanical and electronic compo-nents arranged thereon in the housing in fitting manner.

2. Device as claimed in claim 1, wherein spring-mounted feet form part of the fitting means.
3. Device as claimed in claim 1 or 2 , wherein the housing is provided with one, two or more dovetail -like connecting parts for mounting of the device i the industrial environment, for instance close to a conveyer belt.

4. Device as claimed in claim 1, 2 or 3, wherein one of the plate-like components is provided with a protruding pin for removal thereof from the housing land for placing therein), together with all optical, mechanical and electronic components, or the internal unit of the device .
5. Device as claimed in any of the claims 1-4, wherein the laser source and the sensor sensitive to laser light are arranged on the same board.
6. Device as claimed in any of the claims 1-5, wherein a thermally conductive and electrically insulating slab or mat is incorporated between a cover of the housing and the electrical components.
7. Device as claimed in claim 6, wherein the material has a silicone base.

8. Device as claimed in any of the claims 1-7, wherein relatively many heat -dissipating elements, such as the power source, the laser diode and a control circuit are arranged close to walls of the housing, there-fore on the outer side of the boards .
9. Device as claimed in any of the claims 1-8, wherein the polygonal rotatable mirror is of plastic onto which mirror surfaces are vapour-deposited.
10. Device as claimed in any of the claims 1-9, wherein the polygonal mirror is fixed to the rotor of the motor by means of double-sided adhesive tape.
11. Device as claimed in any of the foregoing claims, wherein an additional sensor sensitive to laser radiation is arranged to detect an end of a scan line.
12. Device as claimed in any of the foregoing claims, wherein the sequence of the inclining mirror surfaces of the polygonal mirror is determined such that the imbalance of the polygonal mirror is reduced.
13. Method for assembly of a device according to any of the foregoing claims, wherein boards with various optical and electronic components are fixed together to form one unit and wherein this unit is subsequently arranged in fitting manner in a housing.
14. Device as claimed in any of the claims 1-12, wherein the housing has outer dimensions (1 x w x h) in the order of magnitude of 12 cm x 9 cm x 4.5 cm.
15. Device as claimed in any of the claims 1-12 or 14, wherein particular components, such as the laser source, mirrors and the like are arranged close to the outer walls of the housing such that a line length of about 60 mm is obtained at the location of the window.
16. Device as claimed in any of the claims 1-12 and/or 14 or 15, wherein the rotation speed of the polygonal rotatable mirror has a value such that about 1200 lines per second are produced.

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