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Patent EP0524653A2 successfully refreshed from Google Patents.
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EP0524653A2 Expired / Lapsed EP ⏱️ 0.0 years remaining

Bar code reader

Assignee: Panasonic Holdings Corp
•
Filing: 1992-07-25
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Granted: —
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Expires: 2012-07-25
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Abstract

Abstract A bar code reader has a CCD for producing an image signal, an amplifier for amplifying the image signal from the CCD and a digitalizing circuit for changing the image signal to binary signal. The CCD operates with an operating voltage Vcc less than 8 V. The amplifier has first and second operational amplifiers each having one voltage source terminal connected to Vcc of 5 V and the other voltage source terminal connected to ground. Also, the digitalizing circuit has a third operational amplifier having one voltage source terminal connected to Vcc of 5 V and the other voltage source terminal connected to ground.

Inventors

  • 👤 Seiichiro Tamai
  • 👤 Keiichi Kobayashi
  • 👤 Hideki Imai
  • 👤 Takahiro Yamao

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-10-26 09:01
CPC Classifications
G; G06; G06K; G06K7/00; G06K7/10; G06K7/10544; G06K7/10821; G06K7/10841; G06K7/10851

Claims Analysis

Total Claims: 9
Claim 1
Independent Claim 144 words
In a bar code reader having a light source for lighting the bar code, an image sensor for receiving the reflected light from the bar code and producing an image signal, a drive circuit for driving the image sensor, an amplifier for amplifying the image signal, and a digitalizing circuit for digitalizing the amplified image signal and producing a digital signal representing the bar code, an improvement comprising: said image sensor comprising light receiving elements which operates with an operating voltage Vcc less than 8 V; said amplifier comprising first and second operational amplifiers each having one voltage source terminal connected to Vcc of 5 V and the other voltage source terminal connected to ground; and said digitalizing circuit comprising a third operational amplifier having one voltage source terminal connected to Vcc of 5 V and the other voltage source terminal connected to ground.
Claim 2
Dependent Claim 19 words
A bar code reader as claimed in Claim 1, wherein said light receiving elements are formed in a CCD.
Claim 3
Dependent Claim 23 words
A bar code reader as claimed in Claim 1, wherein said digitalizing circuit is reset after each scanning operation of said image sensor.
Claim 4
Dependent Claim 26 words
A bar code reader as claimed in Claim 1, further comprising an amplitude control means for controlling the amplitude of the signal produced from said amplifier.
Claim 5
Dependent Claim 28 words
A bar code reader as claimed in Claim 1, further comprising an offset level control means for controlling the offset level of the signal produced from said amplifier.
Claim 6
Dependent Claim 19 words
A bar code reader as claimed in Claim 1, further comprising a processor 14 for decoding the digital signal.
Claim 7
Dependent Claim 21 words
A bar code reader as claimed in Claim 6, further comprising a data communication system for transmitting the decoded digital signal.
Claim 8
Dependent Claim 21 words
A bar code reader as claimed in Claim 7, wherein said data communication system is a wireless system comprising a photodiode.
Claim 9
Dependent Claim 22 words
A bar code reader as claimed in Claim 7, wherein said data communication system is a wireless system comprising a wave generator.

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