Torque is delivered to the cleaning head with a reduced stress concentration.

Stress concentration at the corners of the package board (18) is eliminated.

A force is applied to the breaking bar with the scribed line acting as a stress concentrator.

By such a structure, concentration of an electric field and concentration of a stress can be suppressed, whereby characteristic deterioration of the photoelectric conversion device can be reduced.

As a result, stress concentration in the outer lead (42) can be prevented.

This aims to provide a field element for relieving the stress concentration at a connecting portion.

The initial tiltings of the actuating parts (210, 211) are prevented because the stress concentration line is not generated.

Multiple possible tear seam locations may be defined along stress concentrators arranged in such patterns.

The present invention mitigates concentration of stress due to differences in thermal expansion and prevents damage of lining members.

It also reduces the stress concentration from the base of the hub.

This also reduces high stress concentration at the base of the hub.

An optical scanner having shaft sections prevented from being damaged due to stress concentration.

Advantageously, the interface to the stabilization member is made of a deformable material to reduce surface stress concentration in the stabilization member.

The orientation of the crossover holes (84) minimizes stress concentration caused by the presence of the crossover holes (84).

A reinforcement section (7) is formed in that region of a window hole (5) in which a stress concentration occurs.