Camera Shutter Control via Independent Cam Charging
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Solution Overview
Problem
Conventional single-lens reflex cameras lack independent control over the front and rear shutter curtains, limiting the flexibility and efficiency of the shutter operation sequence.
Innovation Solution
The camera design incorporates a rotating shaft with cams and charge members to independently control and charge the drive forces for the first and second shutter blade sets, allowing for precise control of the shutter blades and mirror positioning, enabling independent operation of the front and rear curtains.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single operational sequence is used to control shutter operations, then the device complexity is reduced, but the operational flexibility and control precision over individual shutter curtains deteriorates
Solution Approach 1:
The patent divides the shutter control system into separate charge members (first charge member 14 and second charge member 16) for the front and rear curtains, allowing independent charging and control of each curtain's drive force through dedicated cam mechanisms
Solution Approach 2:
The patent introduces a rotating shaft (172) with variable cam profiles that dynamically adjust the charging of drive forces during different rotational phases, enabling flexible control sequences where the front curtain can be charged independently of the rear curtain based on operational requirements
2Ease of manufacture
If the front and rear shutter curtains are controlled through a single drive mechanism, then the manufacturing cost is reduced, but the operational efficiency and precision of shutter sequencing deteriorates
Solution Approach 1:
The patent implements different cam profiles (first drive force charge cam face 121a and second drive force charge cam face 122a) with distinct geometric characteristics tailored to the specific positioning requirements of each shutter curtain, allowing precise control of front and rear curtain sequences
Solution Approach 2:
The rotating shaft with cam mechanisms serves as an intermediary that translates a single rotational input into differentiated drive forces for the front and rear curtains, maintaining manufacturing simplicity while achieving precise sequential control through the cam-mediated transmission
3Adaptability or versatility
If independent charge members are introduced for each shutter curtain, then the operational flexibility improves, but the device complexity increases
Solution Approach 1:
The patent merges the first cam (121) and second cam (122) onto a common rotating shaft (172), allowing both independent charge members (14 and 16) to be actuated from a single rotational source, thereby reducing overall system complexity while maintaining independent control capability
Solution Approach 2:
The rotating shaft (172) serves multiple functions simultaneously: it rotates to drive the mirror mechanism, charges the first charge member through the first cam, charges the second charge member through the second cam, and coordinates the timing of both shutter curtains, consolidating multiple control functions into a single universal component
Data Source
Figure 1A~1B
Figure 2
Figure 3
AI summary
In a camera, the first cam is rotated to assume a rotational phase at which drive of the first shutter blade set with the first drive force is not hindered and the second drive force charge cam face in contact with the second charge member charges the second drive force as the rotating shaft is caused to rotate to a first rotational phase. The second drive force charge cam in contact with the second charge member sustains a second drive force charging state during a transition period in which the rotating shaft in the first rotational phase rotates to a second rotational phase. The first drive force charge cam face in contact with the first charge member charges the first drive force and the second drive force charge cam face in contact with the second charge member charges the second drive force as the rotating shaft is caused to rotate from the first rotational phase to the second rotational phase.