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.
Disclosed is a low-cost circuit enabling a microprocessor to monitor the thermal state of an actuator coil, such as a print head.
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
Print Head Thermal Protection Circuitry
Disclosed is a low-cost circuit enabling a microprocessor to monitor the
thermal state of an actuator coil, such as a print head.
The circuit works on the principle of change in resistance, i.e., resistance is
directly proportional to temperature. The schematic is shown in the figure. From
the change in resistance principle V1 at the comparator, input is inversely
proportional to the resistance of the actuator. Therefore, if V2 is constructed as a
reference, the comparator output can be made to change states when RA
T1 has been chosen such that when saturated, its voltage drop is negligible.
The diode D1 is provided to clip inductive voltage spikes, thus protecting the
comparator. The capacitor C1, is provided for filtering. The supply voltage Vss
was placed common to both the load and reference to take advantage of voltage
This technique has been used effectively in the Proprinter product line and
has correspondingly reduce microprocessor overhead and minimized cost.
Page 2 of 2
[This page contains 3 pictures or other non-text objects]