PlayerEffect.cs

using Cinemachine;
using UnityEngine;

public class PlayerEffect : MonoBehaviour
{
    [SerializeField] private CinemachineImpulseSource cinemachineImpulseSource;
    public CinemachineImpulseSource CinemachineImpulseSource => cinemachineImpulseSource;
    
    void OnDamage()
    {
        this.CinemachineImpulseSource.GenerateImpulse();
        
        //　発生源および衝撃の方向・強さを指定できる GenerateImpulseAt もある
        //this.CinemachineImpulseSource.GenerateImpulseAt(position, velocity);
    }
}