Camera Drive With Multiple Timing Belts and Dynamic Tension

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Solution Overview

Problem

Existing camera driving devices face challenges in maintaining optimal tension on timing belts, leading to issues such as shaking, slip, malfunction, wear-out, or power reduction due to deviations in component parameters and decentering, especially when using multiple timing belts for high gear transmission ratios.

Innovation Solution

A camera driving device with a multi-belt structure that includes motor and gear tensioners, utilizing elastic members to automatically adjust tensions on timing belts, allowing for constant tension maintenance despite component decentering or assembly changes, without requiring separate facilities.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Power

If multiple timing belts are used to achieve high gear transmission ratio, then the transmission ratio and torque are improved, but the tension control difficulty and power loss increase

Engineering Contradiction:
Improvetransmission ratioVSAvoidpower loss
Core Design Contradiction:
PowerVSLoss of energy

Solution Approach 1:

The patent implements dynamic tension adjustment by making the tensioner arm movable rather than fixed. The arm can automatically change its position to maintain optimal tension on timing belts under varying load conditions, preventing both excessive tension (power loss) and insufficient tension (slip). This dynamic mechanism resolves the contradiction by adapting tension levels to operational requirements.

Inventive Principle:
Principle #15Dynamics

Solution Approach 2:

The patent changes the tension parameter dynamically through the elastic member and movable tensioner arm structure. By allowing the tensioner arm to move within a defined range, the system automatically adjusts the tension parameter to maintain optimal values, preventing power loss while ensuring sufficient transmission force for high gear ratios.

Inventive Principle:
Principle #35Parameter changes

2Reliability

If manual tension adjustment is performed during assembly, then the initial tension can be set, but the tension cannot be maintained under varying operating conditions

Engineering Contradiction:
Improvetension maintenanceVSAvoidadjustment mechanism
Core Design Contradiction:
ReliabilityVSDevice complexity

Solution Approach 1:

The patent implements a self-adjusting tensioning mechanism where the elastic member and movable tensioner arm automatically maintain proper timing belt tension without external intervention. The system uses the elastic deformation of the member to self-regulate tension levels, eliminating the need for complex external adjustment devices while ensuring reliable tension maintenance under varying operating conditions.

Inventive Principle:
Principle #25Self-service

Solution Approach 2:

The movable tensioner arm provides automatic feedback-based tension control. As the timing belt tension varies with operational conditions, the arm automatically adjusts its position to maintain optimal tension, creating a self-regulating system that responds to changing loads without requiring complex external control mechanisms.

Inventive Principle:
Principle #23Feedback

3Manufacturing precision

If strict quality control on dimensions and clearances is applied, then the initial tension can be maintained, but the system is sensitive to component deviation and decentering

Engineering Contradiction:
Improvedimensional accuracyVSAvoidtolerance to deviation
Core Design Contradiction:
Manufacturing precisionVSAdaptability or versatility

Solution Approach 1:

The patent replaces static, precision-dependent tension control with a dynamic adjustment mechanism. The movable tensioner arm can adapt to component deviations and decentering by automatically adjusting its position, making the system tolerant to manufacturing variations while maintaining reliable timing belt tension without requiring extremely tight dimensional tolerances.

Inventive Principle:
Principle #15Dynamics

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

The device ensures consistent tension on timing belts, preventing power loss and component wear, while enabling high gear transmission ratios and compact configuration, even with deviations in component parameters.

Implementation Method 1

a first elastic member connected between one side of the first mover and one side of the first base... a second elastic member connected between one side of the second mover and one side of the second base

Methodology Applied
Scientific EffectElasticity: Elasticity

Data Source

PatentEP4148496B1Camera driving device having a plurality of timing belts
Publication Date: 2025.08.27 HANWHA VISION CO LTD
  • EP4148496B1 patent drawingFigure 1
  • EP4148496B1 patent drawingFigure 2
  • EP4148496B1 patent drawingFigure 3

AI summary

A camera driving device (100) is provided. The camera driving device (100) includes: a motor (10) configured to generate a driving force; an input pulley (11) attached to the motor (10); a gear assembly (30) including a first gear (31) coupled to the input pulley (11) by a first timing belt (20), and a second gear (32) formed coaxially with the first gear (31), the second gear (32) configured to rotate together with the first gear (31); and an output pulley (41) configured to rotate together with the second gear (32) by a second timing belt (25), wherein a reduction is made according to a gear transmission ratio between the input pulley (11) and the first gear (31), a reduction is made according to a gear transmission ratio between the second gear (32) and the output pulley (41), and a rotation shaft (Cx) of the output pulley (41) may be positioned between a rotation shaft (Ax) of the input pulley (11) and a rotation shaft (Bx) of the first gear (31).