Image forming apparatus and method for controlling image forming apparatus
US-9223246-B2 · Dec 29, 2015 · US
Powder sensor
US9018964B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-9018964-B2 |
| Application number | US-201213710554-A |
| Country | US |
| Kind code | B2 |
| Filing date | Dec 11, 2012 |
| Priority date | Dec 19, 2011 |
| Publication date | Apr 28, 2015 |
| Grant date | Apr 28, 2015 |
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Abstract
Official abstract text for this publication.
A powder sensor includes a piezoelectric element, an oscillator circuit, a first square wave signal generator, a second square wave signal generator, and a phase judgment circuit. The oscillator circuit applies to the piezoelectric element an output signal having a frequency equal to or near a resonance frequency of the piezoelectric element. The first square wave signal generator generates a first square wave signal by converting a terminal voltage of the piezoelectric element. The second square wave signal generator generates a second square wave signal that transits from an initial level to a detection level when the first square wave signal rises or falls in a detection period and that does not transit outside of the detection period. The detection period is a part of each cycle of the output signal of the oscillator circuit. The phase judgment circuit determines phase of the second square wave signal.
First claim
Opening claim text (preview).
What is claimed is: 1. A powder sensor comprising: a piezoelectric element; an oscillator circuit that applies to the piezoelectric element an output signal having a frequency equal to or near a resonance frequency of the piezoelectric element; a first square wave signal generator that generates a first square wave signal by converting a terminal voltage of the piezoelectric element into the first square wave signal; a second square wave signal generator that generates a sec…
Assignees
Inventors
Classifications
- G03G15/0824Primary
Physics · mapped topic
Physics · mapped topic
- G01V9/00Primary
Physics · mapped topic
Physics · mapped topic
- G03G15/0849Primary
Physics · mapped topic
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Frequently asked questions
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- What does patent US9018964B2 cover?
- A powder sensor includes a piezoelectric element, an oscillator circuit, a first square wave signal generator, a second square wave signal generator, and a phase judgment circuit. The oscillator circuit applies to the piezoelectric element an output signal having a frequency equal to or near a resonance frequency of the piezoelectric element. The first square wave signal generator generates a f…
- Who is the assignee on this patent?
- Tdk Corp
- What technology area does this patent fall under?
- Primary CPC classification G03G15/0824. Mapped technology areas include Physics.
- When was this patent published?
- Publication date Tue Apr 28 2015 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 8 related publications on this page (citations in our corpus or others sharing the same primary CPC).