Camera Lens Assembly Linear Guide Pin Cam Groove
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Solution Overview
Problem
Conventional camera lens assemblies with manual rings face difficulties in achieving large rotation angles and smooth operation with minimal force, especially when a single pin is engaged with a spiral groove, leading to cumbersome focus adjustment.
Innovation Solution
A camera lens assembly design featuring a pin engaged with a spiral cam groove and a guide device that allows the lens holder to move only in the optical axis direction, enabling a large circumferential angle and smooth operation with a small force, utilizing a guide rail and carriage block system for precise movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If a single pin is engaged with a spiral groove to enable large rotation angle, then the rotation angle increases, but the operation becomes cumbersome and requires large force
Solution Approach 1:
The patent divides the single pin structure into two separate pins: a first pin engaged with the spiral groove for rotational movement, and a second pin engaged with a parallel groove for linear guidance. This segmentation allows each pin to perform a specific function, resolving the contradiction between large rotation angle and smooth operation.
Solution Approach 2:
The patent introduces a guide structure as an intermediary element that constrains the lens holder's movement to only the optical axis direction. This guide acts as a mediator between the rotational input from the manual ring and the linear output of the lens holder, enabling smooth operation with minimal force while maintaining large rotation angle capability.
2Manufacturing precision
If multiple pins are engaged in the groove to control lens holder movement, then the movement control improves, but the rotation angle of the manual ring becomes difficult to increase
Solution Approach 1:
The patent segments the control function into two distinct pins with separate grooves: the first pin's spiral groove handles the rotational input, while the second pin's parallel groove handles the linear guidance. This segmentation allows the system to achieve both precise movement control and large rotation angle without the limitations of using multiple pins in a single groove.
3Duration of action of moving object
If a single pin is used per groove to increase rotation angle, then the rotation angle increases, but the user cannot operate the manual ring smoothly with small force
Solution Approach 1:
The patent segments the force application and movement control into two separate pin-groove interactions. The first pin engages with the spiral groove to convert rotational force, while the second pin engages with the parallel groove to provide smooth linear guidance. This segmentation reduces the operating force required while maintaining large rotation angle capability.
Solution Approach 2:
The guide structure serves as an intermediary that reduces friction and resistance during operation. By constraining the lens holder to move only in the optical axis direction through the guide rail and carriage block, the system minimizes unwanted movements and reduces the force required by the user to operate the manual ring smoothly.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables precise and effortless focus adjustment with a large rotation angle, allowing users to easily operate the manual ring with minimal force, enhancing the overall precision and usability of the camera lens assembly.
Implementation Method 1
a guide device for guiding the lens holder to move only in a direction parallel to the optical axis
Implementation Method 2
a ring member with which the pin is engaged, the ring member having a cam groove formed in a spiral direction to have a predetermined pitch along an optical axis
Implementation Method 3
a carriage block slidably coupled with the guide rail to move in the direction parallel to the optical axis
Data Source
AI summary
A camera lens assembly includes a lens holder for accommodating at least one lens, a pin protruding from the lens holder in a radial direction of the at least one lens, a ring member with which the pin is engaged, the ring member having a cam groove formed in a spiral direction to have a predetermined pitch along an optical axis and being rotatable about the optical axis according to a user's operation, and a guide device for guiding the lens holder to move only in a direction parallel to the optical axis. In particular, when the ring member rotates, the lens holder on which the pin is formed moves in the direction parallel to the optical axis within the pitch under the guide of the guide device.