Zoom Lens Cam Cylinder Layout for Longer Optical-Axis Travel
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Solution Overview
Problem
Existing zoom lens devices face challenges in increasing the moving distance of a moving cylinder in the optical axis direction without increasing the number of components, leading to issues like component cumulative error and higher costs due to the need for additional components to restrict rotation.
Innovation Solution
The zoom lens device incorporates a first movement group with a straight groove on the moving cylinder and a second movement group with cam follower pins that penetrate the fixed and cam cylinders, allowing for a larger moving distance without additional components by guiding the movement straight along the optical axis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If additional components are added to restrict rotation of the moving cylinder, then the moving distance in optical axis direction can be increased, but the number of components increases leading to higher costs and cumulative error
Solution Approach 1:
The patent combines the rotation restriction function and the movement guiding function into a single integrated mechanism. The cam cylinder with cam groove and the corresponding cam follower pin work together to both restrict rotation and guide the moving cylinder's linear movement in the optical axis direction, eliminating the need for separate components that would be required if these functions were divided into independent mechanisms.
Solution Approach 2:
The cam cylinder assembly serves multiple functions simultaneously: it restricts rotation of the moving cylinder, guides its linear movement along the optical axis, and enables the magnification change operation. This multi-functional design reduces the overall number of components needed in the zoom lens device while achieving the desired moving distance.
2Length of moving object
If additional components are added to restrict rotation, then the moving distance can be increased, but manufacturing costs increase
Solution Approach 1:
By merging the rotation restriction and movement guiding functions into the cam cylinder and cam follower pin mechanism, the patent reduces the total number of components that need to be manufactured and assembled. This integration directly lowers manufacturing costs while achieving the extended moving distance requirement.
3Length of moving object
If additional components are added to restrict rotation, then the moving distance can be increased, but component cumulative error increases
Solution Approach 1:
The integrated cam cylinder and cam follower pin mechanism reduces the number of interfaces and assembly steps between separate components. By combining multiple functions into a single coordinated mechanism, the patent minimizes the accumulation of manufacturing tolerances and alignment errors that would occur with multiple separate components, thereby improving overall positioning precision.
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
This configuration enables a larger moving distance of the moving cylinder in the optical axis direction while reducing the number of components, thus minimizing component cumulative error and costs.
Implementation Method 1
a first movement group that is positioned outside the cam cylinder and that includes a first lens group provided at a distal end portion, and a second movement group that is positioned inside the fixed cylinder and that includes a second lens group. The first movement group and the second movement group move so that a magnification change operation is performed in a case where the cam cylinder rotates
Implementation Method 2
the first movement group includes a first straight groove that guides the first movement group straight
Implementation Method 3
a first cam follower pin that engages with a first cam groove formed at the cam cylinder, and the second movement group includes a second cam follower pin that engages with the first straight groove of the first movement group via the fixed cylinder and the cam cylinder
Data Source
AI summary
Provided is a zoom lens device and an optical device with which it is possible to increase a moving distance of a moving cylinder in an optical axis direction without an increase in number of components, the moving cylinder including a lens group closest to a subject side. A zoom lens device (1) includes a fixed cylinder (30), a cam cylinder (20) that is positioned outside the fixed cylinder (30), a first movement group that is positioned outside the cam cylinder (20) and that includes a first lens group (H1) provided at a distal end portion, and a second movement group that is positioned inside the fixed cylinder (30) and that includes a second lens group (H2). The first movement group includes a first straight groove (4) that guides the first movement group straight and a first cam follower pin (3) that engages with a first cam groove formed at the cam cylinder (20), and the second movement group includes a second cam follower pin (2) that penetrates a second straight groove formed at the fixed cylinder (30) and a second cam groove formed at the cam cylinder (20) and that engages with the first straight groove (4).