The following operators can be used to better focus your queries.
( ) , AND, OR, NOT, W/#
? single char wildcard, not at start
* multi char wildcard, not at start
(Cat? OR feline) AND NOT dog?
Cat? W/5 behavior
(Cat? OR feline) AND traits
Cat AND charact*
This guide provides a more detailed description of the syntax that is supported along with examples.
This search box also supports the look-up of an IP.com Digital Signature (also referred to as Fingerprint); enter the 72-, 48-, or 32-character code to retrieve details of the associated file or submission.
Concept Search - What can I type?
For a concept search, you can enter phrases, sentences, or full paragraphs in English. For example, copy and paste the abstract of a patent application or paragraphs from an article.
Concept search eliminates the need for complex Boolean syntax to inform retrieval. Our Semantic Gist engine uses advanced cognitive semantic analysis to extract the meaning of data. This reduces the chances of missing valuable information, that may result from traditional keyword searching.
A toner sensor is illustrated for use with a dry photocopying developer. The developing and replenishment station is that illustrated in U.S. Patent 3,756,192.
English (United States)
This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
100% of the total text.
Page 1 of 2
Adjustable Toner Sensor
A toner sensor is illustrated for use with a dry photocopying developer. The
developing and replenishment station is that illustrated in U.S. Patent 3,756,192.
The sensor includes a light source 59, a rotating chopper wheel 67, a window
55 for viewing the developer, and a photosensor 61. The chopper wheel 67
includes reference paddles 65 that periodically block the photosensor's view of
the window. Thus, the photosensor alternately observes the reference and the
It is desirable to easily change the toner concentration in the developer mix.
To accomplish this, a variable gain amplifier 10 is provided to allow adjustment of
the photosensor output for the detection of the developer mix. A Hall switch 75
provides an output at each pass of a magnet 73, which operates single-shot 11.
The single-shot operates circuit 12 to sample and hold the reference signal from
photosensor 61. The single-shot output is delayed by delay 13 to operate gate 14
to supply the adjusted developer signal to comparator 15 which compares the
signal to the reference signal from sample and hold circuit 12. Upon completion
of the comparison, a further delayed signal from delay 16 resets the sample and
Thus, variable gain amplifier 10 provides an electronic adjustment of the
sensed developer signal for comparison with the mechanically provided
Page 2 of 2
[This page contains 3 pictures or other non-text objects]