Scanner element having a constant resonance frequency, and optical scanning apparatus and image forming apparatus using such a scanner element
AssigneeRicoh Company, Ltd.
InventorTetsurou Saitoh
Life of this patent
Estimating the term…
Abstract
A scanner element includes a frame part formed by a substrate, a movable plate formed inside the frame part and a torsion bar swingably supporting the movable plate on the frame part. One of the movable plate and the torsion bar has an adjusting part formed by a process of forming the movable plate and the torsion bar so that a ratio of an actual value of a moment of inertia I+ΔI of the movable plate to an actual value of a spring constant K+ΔK of the torsion bar is substantially equal to a ratio of a design value of the moment of inertia I of the movable plate to a design value of the spring constant K of the torsion bar.
Claims16
A scanner element comprising:
- a frame part formed by a substrate;
- a movable plate formed inside the frame part;
- and
- a torsion bar swingably supporting the movable plate on the frame part,
- wherein one of said movable plate and said torsion bar has an adjusting part formed by a process of forming said movable plate and said torsion bar so that a ratio of an actual value of a moment of inertia I+ΔI of said movable plate to an actual value of a spring constant K+ΔK of said torsion bar is substantially equal to a ratio of a design value of the moment of inertia I of said movable plate to a design value of the spring constant K of said torsion bar.
An optical scanning apparatus comprising:
- a light source;
- and
- a scanner element that scans a light emitted by said light source,
- wherein the scanner element includes:
- a frame part formed by a substrate;
- a movable plate formed inside the frame part;
- and
- a torsion bar swingably supporting the movable plate on the frame part,
- wherein one of said movable plate and said torsion bar has an adjusting part formed by a process of forming said movable plate and said torsion bar so that a ratio of an actual value of a moment of inertia I+ΔI of said movable plate to an actual value of a spring constant K+ΔK of said torsion bar is substantially equal to a ratio of a design value of the moment of inertia I of said movable plate to a design value of the spring constant K of said torsion bar.
An image forming apparatus comprising:
- an optical scanning apparatus that scans a light;
- a photo conductor that forms an electrostatic latent image thereon according to the light from said optical scanning apparatus;
- and
- a developer that develops the electrostatic latent image by a toner to form a toner image;
- and
- a transfer unit that transfer the toner image onto a recording medium,
- wherein said optical scanning apparatus includes:
- a light source;
- and
- a scanner element that scans a light emitted by said light source, the scanner element including:
- a frame part formed by a substrate;
- a movable plate formed inside the frame part;
- and
- a torsion bar swingably supporting the movable plate on the frame part,
- wherein one of said movable plate and said torsion bar has an adjusting part formed by a process of forming said movable plate and said torsion bar so that a ratio of an actual value of a moment of inertia I+ΔI of said movable plate to an actual value of a spring constant K+ΔK of said torsion bar is substantially equal to a ratio of a design value of the moment of inertia I of said movable plate to a design value of the spring constant K of said torsion bar.
Dependencies are inferred from the claim text.